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    Refereed journal

    First author

    ​

    1. Oyama, S., T. T. Tsuda, K. Hosokawa, Y. Ogawa, Y. Miyoshi, S. Kurita, A. E. Kero, R. Fujii, Y. Tanaka, A. Mizuno, T. Kawabata, B. Gustavsson and T. Leyser, Auroral molecular-emission effects on the atomic oxygen line at 777.4 nm, Earth, Planets and Space, 70:166, doi:10.1186/s40623-018-0936-z, 2018.

    2. Oyama, S., Kubota, K., Morinaga, T., Tsuda, T. T., Kurihara, J., Larsen, M. F., M. Yamamoto, L. Cai, Simultaneous FPI and TMA measurements of the lower thermospheric wind in the vicinity of the poleward expanding aurora after substorm onset. Journal of Geophysical Research: Space Physics, 122. https://doi.org/10.1002/2017JA024613, 2017 featured in Eos Research Spotlight

    3. Oyama, S., A. Kero, C. J. Rodger, M. A. Clilverd, Y. Miyoshi, N. Partamies, E. Turunen, T. Raita, P. T. Verronen, and S. Saito, Energetic electron precipitation and auroral morphology at the substorm recovery phase, J. Geophys. Res. Space Physics, 122, doi:10.1002/2016JA023484, 2017.

    4. Oyama, S., K. Shiokawa, Y. Miyoshi, K. Hosokawa, B. J. Watkins, J. Kurihara, T. T. Tsuda, and C. T. Fallen, Lower thermospheric wind variations in auroral patches during the substorm recovery phase, J. Geophys. Res. Space Physics, 121, doi:10.1002/2015JA022129, March 31, 2016.  featured in JGR Space Physics

    5. Oyama, S., Y. Miyoshi, K. Shiokawa, J. Kurihara, T. T. Tsuda, and B. J. Watkins, Height-dependent ionospheric variations in the vicinity of nightside poleward expanding aurora after substorm onset, J. Geophys. Res. Space Physics, 119, doi:10.1002/2013JA019704, May 5, 2014.

    6. Oyama, S., T. Watanabe, R. Fujii, S. Nozawa, and T. T. Tsuda, Estimation of the layered ionospheric conductance using data from a multi-wavelength photometer at the European Incoherent Scatter (EISCAT) radar site, Antarctic Record, 57(3), 339-356, December, 2013.

    7. Oyama, S., J. Kurihara, B. J. Watkins, T. T. Tsuda, and T. Takahashi, Temporal variations of the ion-neutral collision frequency from EISCAT observations in the polar lower ionosphere during periods of geomagnetic disturbances, J. Geophys. Res., 117, A05308, doi:10.1029/2011JA017159, March 26, 2012.

    8. Oyama, S., and B. J. Watkins, Generation of atmospheric gravity waves in the polar thermosphere in response to auroral activity, Space Science Review, doi:10.1007/s11214-011-9847-z, November, 2011.

    9. Oyama, S., A. Brekke, T. T. Tsuda, J. Kurihara, and B. J. Watkins, Variance of the vertical ion speed measured with the EISCAT UHF radar in the polar lower ionosphere at Tromsoe, Norway, J. Geophys. Res., 116, A00K06, doi:10.1029/2010JA016129, April 4, 2011.

    10. Oyama, S., K. Shiokawa, J. Kurihara, T. T. Tsuda, S. Nozawa, Y. Ogawa, Y. Otsuka, and B. J. Watkins, Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsoe, Norway, Ann. Geophysicae, 28, 1847-1857, 2010.

    11. Oyama, S., T. T. Tsuda, T. Sakanoi, Y. Obuchi, K. Asamura, M. Hirahara, A. Yamazaki, Y. Kasaba, R. Fujii, S. Nozawa, and B. J. Watkins, Spatial evolution of frictional heating and the predicted thermospheric-wind effects in the vicinity of an auroral arc measured with the Sondrestrom incoherent-scatter radar and the Reimei satellite, J. Geophys. Res., 114, A07311, doi:10.1029/2009JA014091, May 26, 2009.

    12. Oyama, S., B. J. Watkins, S. Maeda, H. Shinagawa, S. Nozawa, Y. Ogawa, A. Brekke, C. Lathuillere, and W. Kofman, Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance, Ann. Geophysicae, 26, 1491-1505, 2008.

    13. Oyama, S., B. J. Watkins, F. T. Djuth, M. J. Kosch, P. Bernhardt, and C. J. Heinselman,Persistent enhancement of the HF pump-induced plasma line measured with a UHF diagnostic radar at HAARP, J. Geophys. Res., 111, A06309, doi:10.1029/2005JA011363, March 15, 2006.

    14. Oyama, S., B. J. Watkins, S. Nozawa, S. Maeda, and M. Conde, Vertical ion motions observed with incoherent-scatter radars in the polar lower ionosphere, J. Geophys. Res., 110, A04302, doi:10.1029/2004JA010705, January 25, 2005.

    15. Oyama, S., B. J. Watkins, S. Maeda, and J. Watermann, Application of a new beam configuration to estimate lower thermospheric vertical velocities at high latitudes with mono-static incoherent scatter radars, Radio Sci., 40, RS4005, doi:10.1029/2004RS003205, April 26, 2005.

    16. Oyama, S., C. Lathuillere, S. Maeda, and B. J. Watkins, Summer-winter dependences of day-night differences in the ion temperature in the polar upper F region, Geophys. Res. Lett., 31, L05806, doi:10.1029/2003GL018820, February 9, 2004.

    17. Oyama, S., S. Nozawa, S. Maeda, Y. Murayama, R. Fujii, and H. Shinagawa, Field-aligned ion motions in the polar E-F transition region: Mean characteristics, J. Geophys. Res., 108(A8), 1334, doi:10.1029/2003JA009830, June 6, 2003.

    18. Oyama, S., M. Ishii, Y. Murayama, H. Shinagawa, S. C. Buchert, S. Nozawa, R. Fujii, and W. Kofman, Generation of atmospheric gravity waves associated with auroral activity in the polar F region, J. Geophys. Res., 106(A9), 18543–18554, doi:10.1029/2001JA900032, February 23, 2001.

    19. Oyama, S., H. Shinagawa, S. C. Buchert, R. Fujii, S. Nozawa, M. Ishii, Y. Murayama, and W. Kofman, Effects of auroral arc on the generation of atmospheric gravity waves in the auroral F-region, Advances in Space Research, 27, 1767-1772, 2001.

    20. Oyama, S., S. Nozawa, S. C. Buchert, M. Ishii, S. Watari, E. Sagawa, W. Kofman, J. Lilensten, and R. Fujii, Effects of atmospheric oscillations on the field-aligned ion motions in the polar F-region, Ann., Geophysicae, 18, 1154-1163, 2000.

     

    Coauthor

    1.  Nishimura, Y., Lessard, M.R., Katoh, Y. et al., Diffuse and Pulsating Aurora, Space Sci Rev, 216: 4. https://doi.org/10.1007/s11214-019-0629-3, 2020.

    2. Xu, H., Shiokawa, K., Oyama, S. et al. High-latitude thermospheric wind study using a Fabry–Perot interferometer at Tromsø in Norway: averages and variations during quiet times. Earth Planets Space 71, 110 (2019) doi:10.1186/s40623-019-1093-8

    3. Kozlovsky, A., S. Shalimov, S. Oyama, K. Hosokawa, M. Lester, Y. Ogawa and C. Hall (2019), Ground Echoes Observed by the Meteor Radar and High-Speed Auroral Observations in the Substorm Growth Phase, J. Geophys. Res., https://doi.org/10.1029/ 0.1029/2019JA026829.

    4. Xu, H., K. Shiokawa, S. Oyama, and Y. Otsuka (2019), Thermospheric wind variations observed by a Fabry-Perot interferometer at Tromsø, Norway, at substorm onsets, Earth, Planets and Space, 71:93, https://doi.org/10.1186/s40623-019-1072-0.

    5. Tanaka, Y.-M, T. Nishiyama, A. Kadokura, M. Ozaki, Y. Miyoshi, K. Shiokawa, S. Oyama, R. Kataoka, M. Tsutsumi, K. Nishimura, K. Sato, Y. Kasahara, A. Kumamoto, F. Tsuchiya, M. Fukizawa, M. Hikishima, S. Matsuda, A. Matsuoka, I. Shinohara, M. Nose, T. Nagatsuma, M. Shinohara, A. Fujimoto, M. Teramoto, R. Nomura, A. Sessai Yukimatu, K. Hosokawa, M. Shoji and R. Latteck (2019), Direct comparison between magnetospheric plasma waves and polar mesosphere winter echoes in both hemispheres, J. Geophys. Res., https://doi.org/10.1029/2019JA026891.

    6. Takeshita, Y., K. Shiokawa, M. Ozaki, J. Manninen, S. Oyama, M. Connors, D. Baishev, V. Kurkin and A. Oinats (2019), Longitudinal extent of magnetospheric ELF/VLF waves using multipoint PWING ground stations at subauroral latitudes, Journal of Geophysical Research: Space Physics, https://doi.org/10.1029/2019JA026810.

    7. Baron, P., Ochiai, S., Dupuy, E., Larsson, R., Liu, H., Manago, N., Murtagh, D., Oyama, S., Sagawa, H., Saito, A., Sakazaki, T., Shiotani, M., and Suzuki, M.: Potential for the measurement of MLT wind, temperature, density and geomagnetic field with Superconducting Submillimeter-Wave Limb-Emission Sounder-2 (SMILES-2), Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2019-217, 2019.

    8. Cai, L., Oyama, S., Aikio, A., Vanhamäki, H., & Virtanen, I. (2019). Fabry-Perot interferometer observations of thermospheric horizontal winds during magnetospheric substorms. Journal of Geophysical Research: Space Physics, 124, 3709–3728. https://doi.org/10.1029/2018JA026241

    9. Kawamura, S., K. Hosokawa, S. Kurita, S. Oyama, Y. Miyoshi, Y. Kasahara, M. Ozaki, S. Matsuda, A. Matsuoka, B. Kozelov, Y. Kawamura, I. Shinohara, Tracking the region of high correlation between pulsating aurora and chorus: simultaneous observations with Arase satellite and ground-based all-sky imager in Russia, J. Geophys. Res, 10.1029/2019JA026496, 2019.

    10. Ozaki, M., Y. Miyoshi, K. Shiokawa, K. Hosokawa, S. Oyama, R. Kataoka, Y. Ebihara, Y. Ogawa, Y. Kasahara, S. Yagitani, Y. Kasaba, A. Kumamoto, F. Tsuchiya, S. Matsuda, Y. Katoh, M. Hikishima, S. Kurita, Y. Otsuka, R. C. Moore, Y. Tanaka, M. Nosé, T. Nagatsuma, N. Nishitani, A. Kadokura, M. Connors, T. Inoue, A. Matsuoka, & I. Shinohara, Visualization of rapid electron precipitation via chorus element wave–particle interactions, Nature Communications, doi:10.1038/s41467-018-07996-z, 2019.

    11. Kurita, S., Y. Miyoshi, K. Shiokawa, N. Higashio, T. Mitani, T. Takashima, A. Matsuoka, I. Shinohara, C. A. Kletzing , J. B. Blake, S. G. Claudepierre, M. Connors, S. Oyama, T. Nagatsuma, K. Sakaguchi, D. Baishev and Y. Otsuka, Rapid loss of relativistic electrons by EMIC waves in the outer radiation belt observed by Arase, Van Allen Probes, and the PWING ground stations, Geophys. Res. Lett., 45, doi:10.1029/2018GL080262, 2018.

    12. Fukizawa, M., T. Sakanoi, Y. Miyoshi, K. Hosokawa, K. Shiokawa, Y. Katoh, Y. Kazama, A. Kumamoto, F. Tsuchiya, Y. Miyashita, Y. Nose, M. Tanaka, Y. Kasahara, M. Ozaki, A. Matsuoka, S. Matsuda, M. Hikishima, S. Oyama, Y. Ogawa, S. Kurita, R. Fujii, Electrostatic electron cyclotron harmonic waves as a candidate to cause pulsating auroras, Geophys. Res. Lett., 45, doi:10.1029/2018GL080145, 2018.

    13. Ozaki, M., K. Shiokawa, Y. Miyoshi, K. Hosokawa, S. Oyama, S. Yagitani, et al., Microscopic observations of pulsating aurora associated with chorus element structures: Coordinated Arase satellite-PWING observations, Geophysical Research Letters, 45. https://doi.org/10.1029/2018GL079812, 2018

    14. Shiokawa, K., M. Ozaki, A. Kadokura, Y. Endo, T. Sakanoi, S. Kurita, Y. Miyoshi, S. Oyama, M. Connors, I. Schofield, J. Michael Ruohoniemi, M. Nose, T. Nagatsuma, K. Sakaguchi, D. G. Baishev, A. Pashinin, R. Rakhmatulin, B. Shevtsov, I. Poddelsky, M. Engebretson, Tero Raita, Y.-M. Tanaka, M. Shinohara, M. Teramoto, R. Nomura, A. Fujimoto, A. Matsuoka, N. Higashio, T. Takashima , I. Shinohara, and Jay M. Albert, Purple auroral rays and global Pc1 pulsations observed at the CIR-associated solar wind density enhancement on March 21, 2017, Geophys. Res. Lett., 45, doi:10.1029/2018GL079103, 2018.

    15. T. T. Tsuda, M. T. Rietveld, M. J. Kosch, S. Oyama, Y. Ogawa, K. Hosokawa, S. Nozawa, T. Kawabata and A. Mizuno, Survey of conditions for artificial aurora experiments by the second electron gyro-harmonic at EISCAT Tromsø using dynasonde data, Earth, Planets and Space201870:94, https://doi.org/10.1186/s40623-018-0864-y, 2018.

    16. T. T. Tsuda, M. T. Rietveld, M. J. Kosch, S. Oyama, K. Hosokawa, S. Nozawa, T. Kawabata, A. Mizuno and Y. Ogawa, Survey of conditions for artificial aurora experiments at EISCAT Tromsø using dynasonde data, Earth, Planets and Space 201870:40, https://doi.org/10.1186/s40623-018-0805-9, 2018.

    17. Shiokawa, K., Y. Kato, Y. Hamaguchi, Y. Yamamoto, T. Adachi, M. Ozaki, S. Oyama, M. Nosé, T. Nagatsuma, Y. Tanaka, Y. Otsuka, Y. Miyoshi, R. Kataoka, Y. Takagi, Y. Takeshita, A. Shinbori, S. Kurita, T. Hori, N. Nishitani, I. Shinohara, F. Tuchiya, Y. Obana, S. Suzuki, N. Takahashi, K. Seki, A. Kadokura, K. Hosokawa, Y. Ogawa, M. Connors, J. M. Ruohoniemi, M. Engebretson, E. Turunen, T. Ulich, J. Manninen, T. Raita, A. Kero, A. Oksanen, M. Back, K. Kauristie, J. Mattanen, D. Baishev, V. Kurkin, A. Oinats, A. Pashinin, R. Vasilyev, R. Rakhmatulin, W. Bristow, and M. Karjala, Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network, Earth, Planets and Space, 69:160, doi: 10.1186/s40623-017-0745-9, 2017.

    18. Nakamura, Y., K. Shiokawa, Y. Otsuka, S. Oyama, S. Nozawa. T. Komolmis, S. Komonjida, D. Neudegg, C. Yuile, J. Meriwether, H. Shinagawa, and H. Jin (2017), Measurement of thermospheric temperatures using OMTI Fabry-Perot interferometers with 70mm etalon, Earth, Planets and Space, 69:57, doi: 10.1186/s40623-017-0643-1.

    19. Turunen, E., A. Kero, P. T. Verronen, Y. Miyoshi, S.-I. Oyama, and S. Saito (2016), Mesospheric ozone destruction by high-energy electron precipitation associated with pulsating aurora, J. Geophys. Res. Atmos., 121, doi:10.1002/2016JD025015.

    20. Yatagai, A., and S. Oyama, Thermospheric Nocturnal Wind Climatology Observed by Fabry–Perot Interferometers over the Asia–Oceania Region, J. Meteorol. Soc. Japan, 94(6), doi:10.2151/jmsj.2016-026, Sep. 2016.

    21. Miyoshi, Y., S. Saito, K. Seki, T. Nishiyama, R. Kataoka, K. Asamura, Y. Katoh, Y. Ebihara, T. Sakanoi, M. Hirahara, S. Oyama, S. Kurita, and O. Santolik (2015), Relation between fine structure of energy spectra for pulsating aurora electrons and frequency spectra of whistler mode chorus waves, J. Geophys. Res. Space Physics, 120, doi:10.1002/2015JA021562.

    22. Takahashi, T., Nozawa, S., Tsuda, T. T., Ogawa, Y., Saito, N., Hidemori, T., Kawahara, T. D., Hall, C., Fujiwara, H., Matuura, N., Brekke, A., Tsutsumi, M., Wada, S., Kawabata, T., Oyama, S., and Fujii, R.: A case study on generation mechanisms of a sporadic sodium layer above Tromsø (69.6° N) during a night of high auroral activity, Ann. Geophys., 33, 941-953, doi:10.5194/angeo-33-941-2015, Aug. 2015.

    23. Hashimoto, A., K. Shiokawa, Y. Otsuka, S.-i. Oyama, S. Nozawa, T. Hori, M. Lester, and M. G. Johnsen, Statistical study of auroral fragmentation into patches, J. Geophys. Res. Space Physics, 120, doi:10.1002/2015JA021000, Aug. 2015.

    24. Miyoshi, Y., S. Oyama, S. Saito, S. Kurita, H. Fujiwara, R. Kataoka, Y. Ebihara, C. Kletzing, G. Reeves, O. Santolik, M. Clilverd, C. J. Rodger, E. Turunen, and F. Tsuchiya (2015), Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations. J. Geophys. Res. Space Physics, 120, 2754–2766, doi: 10.1002/2014JA020690.

    25. Ieda, A., S. Oyama, H. Vanhamäki, R. Fujii, A. Nakamizo, O. Amm, T. Hori, M. Takeda, G. Ueno, A. Yoshikawa, R. J. Redmon, W. F. Denig, Y. Kamide, and N. Nishitani, Approximate forms of daytime ionospheric conductance, J. Geophys. Res. Space Physics, 119, pages 10,397–10,415. doi:10.1002/2014JA020665, Jan. 2015.

    26. Takahashi, T., Nozawa, S., Tsutsumi, M., Hall, C., Suzuki, S., Tsuda, T. T., Kawahara, T. D., Saito, N., Oyama, S., Wada, S., Kawabata, T., Fujiwara, H., Brekke, A., Manson, A., Meek, C., and Fujii, R.: A case study of gravity wave dissipation in the polar MLT region using sodium LIDAR and radar data, Ann. Geophys., 32, 1195-1205, doi:10.5194/angeo-32-1195-2014, Oct. 2014.

    27. Shiokawa, K., A. Hashimoto, T. Hori, K. Sakaguchi, Y. Ogawa, E. Donovan, E. Spanswick, M. Connors, Y. Otsuka, S. Oyama, S. Nozawa, and K. McWilliams, Auroral fragmentation into patches, J. Geophys. Res. Space Physics, 119, 8249–8261, doi:10.1002/2014JA020050, Nov. 2014.

    28. Tsuda, T., S. Nozawa, T. D. Kawahara, T. Kawabata, N. Saito, S. Wada, Y. Ogawa, S. Oyama, C. M. Hall, M. Tsutsumi, M. K. Ejiri, S. Suzuki, T. Takahashi, T. Nakamura, Decrease in sodium density observed during auroral particle precipitation over Tromsø, Norway, GRL, 40, DOI: 10.1002/grl.50897, Oct. 2013.

    29. Shiokawa, K., M. Mori, Y. Otsuka, S. Oyama, S. Nozawa, S. Suzuki, and M. Connors, Observation of nighttime medium-scale travelling ionospheric disturbances by two 630-nm airglow imagers near the auroral zone, J. Atmos. Solar-Terr. Phys., 103, 184-194, Sep., 2013.

    30. Shiokawa, K., M. Mori, Y. Otsuka, S. Oyama, and S. Nozawa, Motion of high-latitude nighttime medium-scale traveling ionospheric disturbances associated with auroral brightening, J. Geophys. Res., 117, A10316, doi:10.1029/2012JA017928, Oct., 2012.

    31. Nozawa, S., C. M. Hall, M. Tsutsumi, A. Brekke, Y. Ogawa, T. T. Tsuda, S. Oyama, and R. Fujii, Mean winds, tides, and quasi-2 day waves above Bear Island, J. Atmos. Solar-Terr. Phys., doi: 10.1016/j.jastp.2012.05.002, Jun, 2012.

    32. Shiokawa, K., Y. Otsuka, S. Oyama, S. Nozawa, M. Satoh, Y. Katoh, Y. Hamaguchi, Y. Yamamoto, and J. Meriwether, Development of low-cost sky-scanning Fabry-Perot interferometers for airglow and auroral studies, Earth Planets Space, 64(11), 1033-1046, doi:10.5047/eps.2012.05.004, Nov, 2012.

    33. Tsuda, T. T., S. Nozawa, T. Kawahara, T. Kawabata, N. Saito, S. Wada, C. Hall, S. Oyama, Y. Ogawa, S. Suzuki, T. Ogawa, T. Takahashi, H. Fujiwara, R. Fujii, N. Matuura, and A. Brekke, Fine structure of sporadic sodium layer observed with a sodium lidar at Tromsø, Norway, Geophys. Res. Lett., 38, L18102, doi:10.1029/2011GL048685, August, 2011.

    34. Kurihara, J., Y. Ogawa, S. Oyama, S. Nozawa , M. Tsutsumi , C. Hall , Y. Tomikawa , R. Fujii,Links between a stratospheric sudden warming and thermal structures and dynamics in the high-latitude mesosphere, lower thermosphere, and ionosphere, Geophys. Res. Lett., 37, L13806, doi:10.1029/2010GL043643, Jul. 2010.

    35. Nozawa, S., Y. Ogawa, S. Oyama, H. Fujiwara, T. Tsuda, A. Brekke, C. M. Hall, Y. Murayama, S. Kawamura, H. Miyaoka, and R. Fujii, Tidal waves in the polar lower thermosphere observed using the EISCAT long run data set obtained in September 2005, J. Geophy. Res., 115, A08312, doi:10.1029/2009JA015237, Aug. 2010.

    36. Fujii, R., Y. Iwata, S. Oyama, S. Nozawa, and Y. Ogawa, Relations between proton auroras, intense electric field and ionospheric electron density depletion, J. Geophys. Res., A09304, doi:10.1029/2009JA01431, Sep. 2009.

    37. Tsuda, T. T., S. Nozawa, S. Oyama, T. Motoba, Y. Ogawa, H. Shinagawa, N. Nishitani, K. Hosokawa, N. Sato, M. Lester, and R. Fujii, Acceleration mechanism of high-speed neutral wind observed in the polar lower thermosphere, J. Geophys. Res., 114, A04322, doi:10.1029/2008JA013867, Apr. 2009.

    38. Maeda, S., Y. Ogawa, K. Hosokawa, S. Nozawa, S. Oyama, T. Tsuda and A. Brekke, Ion heating in high-speed flow channel within the duskside cell of the polar-cap ion convection under large IMF-By condition, J. Geophys. Res., A11307, doi:10.1029/2009JA014300, Nov. 2009.

    39. Kurihara, J., S. Oyama, S. Nozawa, T. T. Tsuda, R. Fujii, Y. Ogawa, H. Miyaoka, N. Iwagami, T. Abe, K.-I. Oyama, M. Kosch, A. Aruliah, E. Griffin, and K. Kauristie, Temperature enhancements and vertical winds in the lower thermosphere associated with auroral heating during the Dynamics and Energetics of the Lower Thermosphere in Aurora (DELTA) campaign, J. Geophys. Res., A12306 doi:10.1029/2009JA014392, Dec. 2009.

    40. Burton, L. M., J. A. Cohen, R. Pradipta, A. Labno, M. C. Lee, O. Batishchev, D. L. Rokusek, S. P. Kuo, B. J. Watkins, and S. Oyama, Excitation and diagnosis of cascading Langmuir waves in ionospheric plasmas at Gakona, Alaska, Phys. Scr., 014030 doi:10.1088/0031-8949/2008/T132/014030, 2008.

    41. Cohen, J. A., L. M. Burton, R. Pradipta, A. Labno, M.C. Lee, S.P. Kuo, B.J. Watkins, and S. Oyama, Ionospheric Ducts and Plasma Waves Induced by HF Heater over Gakona, Proceedings of URSI General Assembly, URSI General Assembly, Chicago, USA, 2008.

    42. Kosch M. J., T. Pedersen, E. Mishin, S. Oyama, J. Hughes, A. Senior, B. Watkins, B. Bristow, Coordinated optical and radar observations of ionospheric pumping for a frequency pass through the second electron gyroharmonic at HAARP, J. Geophys. Res., 112, A06325, doi:10.1029/2006JA012146, Jun. 2007.

    43. Kosch M. J., T. Pedersen, E. Mishin, M. Starks, E. Gerken-Kendall, D. Sentman, S. Oyama, B. Watkins, Temporal evolution of pump beam self-focusing at the High-Frequency Active Auroral Research Program, J. Geophys. Res., 112, A08304, doi:10.1029/2007JA012264, Aug. 2007.

    44. Shinagawa, H., and Oyama, S., A two-dimensional simulation of thermospheric vertical winds in the vicinity of an auroral arc, Earth Planets and Space, 58(9), 1173-1181, Sep. 2006.

    45. Shinagawa, H., S. Oyama, S. Nozawa, S. C. Buchert, R. Fujii, and M. Ishii, Thermospheric and ionosphric dynamics in the auroral region, Advances in Space Research, 31(4), 951-956, Apr. 2003.

    46. Nozawa, S., S. Imaida, A. Brekke, C. Hall, C. Meek, A. Manson, S. Oyama, K. Dobashi, and R. Fujii, The quasi 2-day wave observed in the polar mesosphere, J. Geophys. Res., 108, 10.1029/2002JD002440, Jan. 2003.

    47. Nozawa, S., H. Iwahashi, A. Brekke, C. M. Hall, C. Meek, A. Manson, S. Oyama, Y. Murayama, and R. Fujii, The quasi 2-day wave observed in the polar mesosphere (2): Comparison of the characteristics observed at Tromso and Poker Flat, J. Geophys. Res., 108 , 101029/2002JD003221, Dec. 2003.

    48. Fujii, R., S. Oyama, S. C. Buchert, S. Nozawa, and N. Matuura, Field-aligned ion motions in the E and F region, J. Geophys. Res., 107, 10.1029/ 2001JA900148, May 2002.

    49. Nozawa, S., A. Brekke, A. Manson, C. M. Hall, C. Meek, K. Morise, S. Oyama, K. Dobashi, and R. Fujii, A comparison study of the auroral lower thermopsheric neutral winds derived by the EISCAT UHF radar and the Tromso radar, J. Geophys. Res., 107, 10.1029/2000JA007581, Aug. 2002.

    50. Ishii, M., S. Oyama, S. Nozawa, R. Fujii, E. Sagawa, S. Watari, and H. Shinagawa, Dynamics of neutral wind in the polar region observed with two Fabry-Perot interferometers, Earth Planets Space, 51, 833-844, Jul. 1999.

     

    Supplements

    1. Oyama, S., S. Nozawa, R. Fujii, K. Shiokawa, Y. Otsuka, and T. T. Tsuda, Optical instruments of STEL, Nagoya University at the EISCAT radar site in Tromsø, Norway, CAWSES-II Kickoff Symposium in Japan, Proceedings, 113-116. 2010.

    2. Nozawa, S., Y. Ogawa, S. Oyama, H. Miyaoka, T. Kawahara, T. T. Tsuda, and M. Tsutsumi, Research on the lower thermosphere and mesosphere using EISCAT radars, and other instruments, CAWSES-II Kickoff Symposium in Japan, Proceedings, 46-48, 2010.

    3. Kurihara, J., Y. Ogawa, S. Oyama, S. Nozawa, M. Tsutsumi, C. M. Hall, Y. Tomikawa, and R. Fujii, Links between a stratospheric sudden warming and thermal structures and dynamics in the high-latitude mesosphere, lower thermosphere, and ionosphere, CAWSES-II Kickoff Symposium in Japan, Proceedings, 51-52, 2010.

    4. Ogawa, Y., and EISCAT Japan project team, Long-term variations of the polar ionosphere and thermosphere observed with European Incoherent Scatter (EISCAT) radars, CAWSES-II Kickoff Symposium in Japan, Proceedings, 76-78, 2010.

    5. Tsuda, T. T., S. Nozawa, T. D. Kawahara, T. Kawabata, S. Oyama, R. Fujii, Y. Ogawa, N. Saito, S. Wada, A. Brekke, and C. M. Hall, A sodium lidar project at Tromsø, Norway: First report on test observations at Wako, Japan, CAWSES-II Kickoff Symposium in Japan, Proceedings,121-124, 2010.

    6. Oyama, S., and B. J. Watkins, Artificial ionospheric irregularities measured with the MUIR (Modular UHF Ionospheric Radar) at HAARP (High Frequency Active Auroral Research Program), National Institute of Information and Communications Technology, Seasonal Report, 53(1/2), 95-102, 2007.

    7. Oyama, S., Y. Murayama, M. Ishii, M. Kubota Development of SALMON system and the environment data transfer experiment, Journal of Communications Research Laboratory, 2002.

     

     

    Invited talk

    1. Oyama, S., J. Kurihara, T. T. Tsuda, K. Shiokawa, Y. Miyoshi, B. J. Watkins, Thermospheric wind variations in the pulsating aurora, Asia Oceania Geosciences Society, Sapporo, July 2014.

    2. Oyama, S., Aurora and thermospheric dynamics, Japan-Norway symposium on Space Science in Polar Region, Oslo, June, 2012.

    3. Oyama, S., Small-scale thermospheric wind dynamics at high latitudes, STEL-KASI workshop, Nagoya, October 2010.

    4. Oyama, S., Small-scale auroral GW observations, ISSI-workshop coupling, Bern, Switzerland, September, 2010.

    5. Oyama, S., S. Nozawa, R. Fujii, K. Shiokawa, Y. Otsuka, and T. T. Tsuda, Report of the STEL optical observation at the northern Scandinavia by March 2010, Japan Geoscience Union Meeting 2010, Makuhari, May 2010.

    6. Oyama, S., S. Maeda, H. Shinagawa, and B. J. Watkins, Vertical motions in the polar lower thermosphere/ionosphere: Recent results from the incoherent-scatter radar, GSSS-2007, Greenland, May 2007.

    7. Oyama, S., K. Shiokawa, A. Aikio, L. Cai, M. Hirahara, B. J. Watkins, C. T. Fallen, M. G. Conde, and A. Yatagai, Dependency of the thermospheric dynamics on the auroral morphology, ISROSES-III, Varna, Bulgaria, September 2016.

    8. Oyama, S., A. Aikio, M. Conde, H. Vanhamäki, I. Virtanen, L. Cai, K. Kubota, T. Morinaga, T. T. Tsuda, J. Kurihara, M. F. Larsen, M. Yamamoto, M. Hirahara, and K. Shiokawa, New insights found from coalescence of the ionospheric and thermospheric measurements at auroral latitudes, JpGU 2018, Makuhari Japan, May 2018.

    9. Oyama, S., A. E. Kero, C. Rodger, M. A. Clilverd, Y. Miyoshi, N. Partamies, E. Turunen, T. Raita, P. T. Verronen, S. Saito, K. Hosokawa, Y. Ogawa, S. Kurita, S. Nozawa, H. Miyaoka, Y. Tanaka, and R. Fujii, Coordinated observations with the ground-based instruments and satellites to study energetic electron precipitation and auroral morphology at the substorm recovery phase, International HEPPA-SOLARIS Workshop, Roanoke, USA, June 2018.

     

    Oral/Poster presentation (international only)

    1. Oyama, S., J. Kurihara, T. T. Tsuda, K. Shiokawa, Y. Miyoshi, and B. J. Watkins, Asia Oceania Geosciences Society, Sapporo, July 2014.

    2. Oyama, S., J. Kurihara, T. T. Tsuda, K. Shiokawa, Y. Miyoshi, and B. J. Watkins, Ionospheric effects on the lower-thermospheric wind in the vicinity of nightside poleward expanding aurora after substorm onset, ICS-12, Ise-Shima, November 2014.

    3. Shiokawa, K., A. Hashimoto, T. Hori, K. Sakaguchi, Y. Ogawa, E. Donovan, E. Spanswick, M. Connors, Y. Otsuka, S. Oyama, S. Nozawa, and K. McWilliams, Auroral Fragmentation Into Patches During the Substorm Recovery Phase, ICS-12, Ise-Shima, November 2014.

    4. Oyama, S., K. Hosokawa, Y. Miyoshi, K. Shiokawa, J. Kurihara, T. T. Tsuda, and B. J. Watkins, A proposal to the dissipated energy budget in the auroral ionosphere at the substorm recovery phase: Challenge from thermospheric wind variations in the pulsating aurora, AGU Fall Meeting, December 2014.

    5. Hashimoto, A., K Shiokawa, Y. Otsuka, S. Oyama, S. Nozawa, T. Hori, M. Lester, Statistical study of auroral fragmentation into patches, AGU Fall Meeting, December 2014.

    6. Nakamura, Y., K. Shiokawa, Y. Otsuka, S. Oyama, S. Nozawa, J. W. Meriwether, Statistical analysis of thermospheric temperatures using four Fabry-Perot interferometers at high and low latitudes, AGU Fall Meeting, December 2014.

    7. S. Oyama, M. K. Ejir, S. Suzuki, K. Shiokawa, T. Nakamura, M. Tsutsumi, Y. Tomikawa, T. T. Tsuda, S. Nozawa, T. Takahashi, CHARACTERISTICS OF THE MESOSPHERIC GRAVITY WAVES DERIVED FROM OH AIRGLOW IMAGES AT TROMSOE, NORWAY, Third International Symposium on the Arctic Research, Tokyo, January, 2013.

    8. S. Oyama, S. Nozawa, R. Fujii, K. Shiokawa, Y. Otsuka, T. Takahashi, CURRENT STATUS OF THE STEL OPTICAL OBSERVATIONS AT THE TROMSOE EISCAT RADAR SITE, Third International Symposium on the Arctic Research, Tokyo, January, 2013.

    9. T. T. Tsuda, S. Nozawa, T. D. Kawahara, T. Kawabata, N. Saito, S. Wada, S. Oyama, Y. Ogawa, S. Suzuki, T. Takahashi, T. Nakamura, SODIUM DENSITY VARIATION DURING AURORAL PARTICLE PRECIPITATIONS, Third International Symposium on the Arctic Research, Tokyo, January, 2013

    10. H. Miyaoka, S. Nozawa, Y. Ogawa, S. Oyama, R. Fujii, C. Heinselman, EISCAT-JAPAN COLLABORATIVE STUDIES DRIVED BY EISCAT/EISCAT_3D RADARS, Third International Symposium on the Arctic Research, Tokyo, January, 2013.

    11. S. Oyama, S. Suzuki, K. Shiokawa, M. K. Ejiri, T. Nakamura, M. Tsutsumi, Y. Tomikawa, T. T. Tsuda, S. Nozawa, and T. Takahashi, Researching activity of the mesospheric gravity wave with optical instruments at Tromsoe, Norway, Antarctic Gravity Wave Imaging Network workshop, Tokyo, March 2013.

    12. Oyama, S., J. Kurihara, B. J. Watkins, T. T. Tsuda, and T. Takahashi, Temporal variations of the ion-neutral collision frequency in the polar lower ionosphere during periods of geomagnetic disturbances, The 16th EISCAT international symposium, Lancaster, UK, August 2013.

    13. Oyama, S., J. Kurihara, T. T. Tsuda, Y. Miyoshi, K. Shiokawa, and B. J. Watkins, Height-dependent ionospheric responses associated with substorm onset measured with the EISCAT UHF radar, The 16th EISCAT international symposium, Lancaster, UK, August 2013.

    14. Ogawa, Y., M. Sawatsubashi, S. C. Buchert, K. Hosokawa, S. Taguchi, S. Nozawa, S. Oyama, T. T. Tsuda, and R. Fujii, Relationship between auroral substorm and ion upflow in the nightside polar ionosphere, The 16th EISCAT international symposium, Lancaster, UK, August 2013.

    15. Nakamura, Y., K. Shiokawa, Y. Otsuka, S. Oyama, and S. Nozawa, Improvement of the method for measuring thermospheric temperature using small Fabry-Perot interferometers, the International CAWSES-II Symposium, November, 2013.

    16. Nozawa, S., T. Kawahara, T. T. Tsuda, N. Saito, M. Tsutsumi, S. Wada, H. Fujiwara, T. Takahashi, T. Kawabata, S. Oyama, C. Hall, A. Brekke, and R. Fujii, Variations of neutral temperature and winds in the polar mesosphere and lower thermosphere above Tromsø, the International CAWSES-II Symposium, November, 2013.

    17. Hashimoto, A., K.Shiokawa, Y.Otsuka, S. Oyama, and S.Nozawa, Statistical analysis of auroral structures related to the pressure-driven plasma instability based on ground optical observations, the International CAWSES-II Symposium, November, 2013.

    18. Oyama, S., S. Nozawa, R. Fujii, K. Shiokawa, Y. Otsuka, T. T. Tsuda, and T. Takahashi, STEL optical observations at the Tromsø EISCAT radar site by March 2013 and contributions to CAWSES-II, the International CAWSES-II Symposium, November, 2013.

    19. Oyama, S., J. Kurihara, T. T. Tsuda, Y. Miyoshi, K. Shiokawa, and B. J. Watkins, Height-dependent ionospheric responses around auroras associated with substorm onset measured with the EISCAT UHF radar, the International CAWSES-II Symposium, November, 2013.

    20. Ogawa, Y., M. Sawatsubashi, S. C. Buchert, K. Hosokawa, S. Taguchi, S. Nozawa, S. Oyama, T. T. Tsuda and R. Fujii, Relationship between auroral substorm and ion upflow in the nightside polar ionosphere, the International CAWSES-II Symposium, November, 2013.

    21. Tsuda, T. T., N. Matuura, S. Nozawa, T. D. Kawahara, T. Kawabata, N. Saito, S. Wada, Y. Ogawa, M. Tsutsumi, C. M. Hall, S. Oyama, T. Takahashi, M. K. Ejiri, and T. Nakamura, Sodium layer variations observed above Tromsø, Norway (69.6ºN, 19.2ºE), the International CAWSES-II Symposium, November, 2013.

    22. Miyaoka, H., S. Nozawa, Y. Ogawa, S. Oyama, T. Nakamura, R. Fujii, and C. Heinselman, Toward new collaborative studies with EISCAT and EISCAT_3D radars, the International CAWSES-II Symposium, November, 2013.

    23. Shiokawa, K., A. Hashimoto, K. Sakaguchi, Y. Ogawa, E. Donovan, E. Spanswick, M. Connors, Y. Otsuka, S. Oyama, S. Nozawa, Auroral fragmentation due to macroscopic pressure-driven instability, American Geophysical Union Fall meeting 2013, December, 2013.

    24. Miyoshi, Y., S. Oyama, S. Saito, H. Fujiwara, R. Kataoka, and Y. Ebihara, Subrelativistic electron precipitations associated with the pulsating aurora: EISCAT observation and computer simulation, American Geophysical Union Fall meeting 2013, December, 2013.

    25. Takahashi, T., S. Nozawa, T. Tsuda, S. Oyama, H. Fujiwara, M. Tsutsumi, T. Kawahara, N. Saito, S. Wada, T. Kawabata, and N. Matuura, Variations of the neutral temperature inside an SSL during perioda night of high auroral activity above at Tromsø, American Geophysical Union Fall meeting 2013, December, 2013.

    26. Oyama, S., Y. Miyoshi, K. Shiokawa, J. Kurihara, T. T. Tsuda, and B. J. Watkins, Ionospheric/lower-thermospheric variations in the vicinity of night-side poleward expanding aurora around substorm onset, American Geophysical Union Fall meeting 2013, December, 2013.

    27. S. Oyama, Aurora and thermospheric dynamics, Japan-Norway symposium on Space Science in Polar Region, Oslo, June, 2012.

    28. Shiokawa, K., M. Mori, Y. Otsuka, S. Oyama, and S. Nozawa, Motion of high-latitude nighttime medium-scale traveling ionospheric disturbances associated with auroral brightening, AOGS, Singapole, August, 2012.

    29. S. Oyama, Shiokawa K., Suzuki S., Nozawa S., Otsuka Y., Tsutsumi M., Hall C. M., Meek C., and Manson A., Characteristics of the mesospheric gravity wave observed with an all-sky camera at Tromsoe, Norway in 2009-2010, The 4thIAGA/ICMA/CAWSES-II TG4 Workshop, Prague, Czech, February 2011.

    30. Shiokawa, K., M. Mori, S. Oyama, Y. Otsuka, S. Nozawa, and M. Connors, Observations of nighttime medium-scale travelling ionospheric disturbances by 630-nm airglow imagers near the auroral zone, IUGG, Melbourne, Australia, June, 2011.

    31. A. Aruliah, H.-C.I. Yiu., I.McWhirter, M.J. Kosch, K. Shiokawa, S. Oyama, S. Nozawa, V. Howells, I. McCrea, Determining the 630nm emission altitude using modelling and observations from a tristatic configuration of Fabry-Perot Interferometers and EISCAT radars, 38th COSPAR Scientific Assembly 2010, Bremen, Germany, July, 2010.

    32. J. Kurihara, S. Oyama, S. Nozawa, and R. Fujii, M. Tsutsumi, Y. Ogawa, and Y. Tomikawa, C. Hall, Impacts of a stratospheric sudden warming on thermal structures in the high-latitude mesosphere, lower thermosphere, and ionosphere, 38th COSPAR Scientific Assembly 2010, Bremen, Germany, July, 2010.

    33. S. Oyama, Kazuo Shiokawa, Satonori Nozawa, Yuichi Otsuka, Masaki Tsutsumi, Shin Suzuki, Chris M. Hall, Chris Meek, and Alan Manson, Propagation characteristics of nighttime mesospheric waves observed with an all-sky camera at Tromsoe, Norway in 2009-2010, 38th COSPAR Scientific Assembly 2010, Bremen, Germany, July, 2010.

    34. K. Shiokawa, Jens Oberheide, A. Hertzog, Amit K. Patra, Alan Manson, Anasuya Arulia, Anne Smith, Anthea Coster, Anto-nia Haser, Archana Bhattacharya, Art Richmond, Babatunde Rabiu, Barclay Clemesha, Bernd Funke, Bob Vincent, Carlos Martinis, Ceser La Hoz, Charles Lin, Chris Hall, Christian von Savigny, Christiano Garnett Marques Brum, Christina Arras, Christos Haldoupis, Duggirala Pallamraju, Damian Murphy, Dave Fritts, David Hysell, Dora Pancheva, Elsayed Talaat, Erich Becker, Esayas Shume, Esphan Alam Kherani, Gang Lu, Gerald Lehmacher, Guiping Liu, Hanli Liu, Hermann Luhr, Hiroyuki Shinagawa, Hisao Takahashi, Hitoshi Fujiwara, Huigen Yang, Huixin Liu, Inez S. Batista, Jorge L. Chau, Je  Forbes, Jiang Guoying, Jiyao Xu, Joan Alexander, Jonathan Makela, Kaoru Sato, Larisa Goncharenko, Lee-Anne McKinnell, Libo Liu, Ludger Scherliess, Mark Conde, Mamoru Yamamoto, Manfred Ern, Mangalathayil A. Abdu, Manuel Lopez-Puertas, Markus Rapp, Maura Hagan, Michael Rietveld, Miguel Larsen, Mike Kosch, Mike Nicholls, Mike Taylor, Nanan Balan, Nikolai Gavrilov, Nick Mitchell, Peter Dyson, Peter Ho mann, Peter Preusse, Petra Koucka Knizova (Sauli), Plamen Mukhtarov, Qian Wu, Ricardo Buriti, Ruiyuan Liu, Ruth Lieberman, S. Gurubaran, Satonori Nozawa, Shin-ichiro Oyama, Scott England, Scott Palo, Sean Bruinsma, Sergey Shalimov, Sheila Kirkwood, T. K. Ramkumar, Takuya Tsugawa, Takashi Maruyama, Takuji Nakamura, Tao Li, Tiger Liu, Tom Immel, Toshitaka Tsuda, Ulrich Achatz, Weixing Wan, Werner Singer, William Ward, Yuichi Otsuka, Yogeshwar Sahai, and Yue Deng, CAWSES-II TASK GROUP 4: WHAT IS THE GEOSPACE RESPONSE TO VARIABLE INPUTS FROM THE LOWER ATMOSPHERE?, 38th COSPAR Scientific Assembly 2010, Bremen, Germany, July, 2010.

    35. S. Oyama, Small-scale auroral GW observation, ISSI Earth Science Workshop, Bern, Switzerland, September 2010.

    36. S. Oyama, Small-scale thermospheric wind dynamics at high latitudes, STEL-KASI workshop, Nagoya Japan, October 2010.

    37. K. Shiokawa, M. Mori, D. Fukushima, Y. Otsuka, S. Oyama, S. Nozawa, M. G. Connors, Gravity waves and instabilities in the ionosphere imaged by the Optical Mesosphere Thermosphere Imagers (OMTIs), 2010 AGU Fall Meeting, San Francisco, December 2010.

    38. M. Mori, K. Shiokawa, S. Oyama, Y. Otsuka, S. Nozawa, M. G. Connors, Study of auroral-zone MSTIDs using 630nm airglow images at Tromsoe, Norway and Athabasca, Canada, 2010 AGU Fall Meeting, San Francisco, December 2010.

    39. S. Oyama, K. Shiokawa, S. Suzuki, S. Nozawa, Y. Otsuka, M. Tsutsumi, C. M. Hall, C. Meek, and A. H. Manson, Propagation direction of the nighttime mesospheric gravity waves in the OH airglow images at Tromsø, Norway in winter 2009, 2010 AGU Fall Meeting, San Francisco, December 2010.

    40. T. T. Tsuda, S. Nozawa, T. Kawahara, T. Yamasaki, S. Oyama, R. Fujii, Y. Ogawa, N. Saito, S. Wada, A. Brekke, and C. M. Hall, A sodium lidar project at Tromsø, Norway: First report on test observations at Wako, Japan and current status, 2010 AGU Fall Meeting, San Francisco, December 2010.

    41. Otsuka, Y., K. Shiokawa, S. Oyama, M. Satoh, Y. Katoh, Y. Hamaguchi, Y. Yamamoto, S. Nozawa, T. Ogawa, J. W. Meriwether, Development of four Fabry-Perot interferometers for measurements of thermospheric wind and temperature, 2009 AGU Fall meeting, San Francisco, 2009.

    42. Sheerin, J. P., N. Adham, J. M. Gerres, M. R. Keith, A. C. Wittbrodt, B. J. Watkins, W. A. Bristow, P. A. Bernhardt, C. A. Selcher, S. Oyama, Studies of Strong Langmuir Turbulence Experiments at HAARP, 2009 AGU Fall meeting, San Francisco, 2009.

    43. Kurihara, J., S. Oyama, S. Nozawa, R. Fujii, Y. Ogawa, N. Iwagami, T. Abe, M. F. Larsen, M. Yamamoto, and S. Watanabe, DELTA-2 CAMPAIGN: Coordinated sounding rocket and ground-based observations of the dynamics and energetics in the polar lower thermosphere, 19th ESA Symposium on European Rocket and Balloon Programmes and Related Research, Germany, 2009.

    44. Kurihara, J., S. Oyama, S. Nozawa, R. Fujii, Y. Ogawa, N. Iwagami, T. Abe, M. Yamamoto, S. Watanabe, T. Yokoyama, S. Nanbu, K. Yoshida, and M. F. Larsen, DELTA-2 Campaign: Coordinated Observations of the Dynamics and Energetics in the Polar Lower Thermosphere, Asia Oceania Geosciences Society, Singapore, 2009.

    45. Oyama, S., S. Nozawa, R. Fujii, and T. T. Tsuda, Estimation of the layered ionospheric conductance using data taken with the multi-wavelength photometer and the EISCAT UHF radar, 14th International EISCAT workshop, 2009.

    46. Oyama, S., K. Shiokawa, J. Kurihara, S. Nozawa, T. T. Tsuda, Y. Koizumi-Kurihara, Y. Otsuka, M. Tsutsumi, C. M. Hall, C. Meek, and A. Manson, Initial reports of DELTA-2 campaign: tides measured with FPI, MF radar, and meteor radar, 14th International EISCAT workshop, 2009.

    47. Oyama, S., K. Shiokawa, J. Kurihara, S. Nozawa, T. T. Tsuda, R. Fujii, and Y. Otsuka, Initial reports of DELTA-2 campaign: results from FPI and all-sky cameras, 14th International EISCAT workshop, 2009.

    48. Kurihara, J., S. Oyama, S. Nozawa, R. Fujii, Y. Ogawa, N. Iwagami, T. Abe, M. F. Larsen, M. Yamamoto, Y. Yokoyama, S. Watanabe, S. Nanbu, and K. Yoshida, Initial reports of DELTA-2 campaign: overview of the Dynamics and Energetics of the Lower Thermosphere in Aurora 2 campaign, 14th International EISCAT workshop, 2009.

    49. Nozawa, S., Oyama, S., Y. Ogawa, J. Kurihara, M. Tsutsumi, and R. Fujii, Initial reports of DELTA-2 campaign: results from the EISCAT radar observations, 14th International EISCAT workshop, 2009.

    50. Tsuda, T. T., S. Nozawa, S. Oyama, Y. Ogawa, Statistical study of high-speed neutral winds in the lower thermosphere based on EISCAT Svarlbard radar observations, 14th International EISCAT workshop, 2009.

    51. Kurihara-Koizumi, Y., S. Nozawa, S. Oyama, R. Fujii, S. Kawamura, Y. Murayama, and C. Hall, Characteristics of atmospheric tidal wave in the polar mesosphere observed with two MF radars at Tromsø and Poker Flat over 10 years, 14th International EISCAT workshop, 2009.

    52. Sheerin, J.P., M.E. Bacon, J.M. Gerres, M.R. Keith, K.F. Siehl, D.J. Sitar, B.J. Watkins, W.A. Bristow, S. Oyama, P.A. Bernhardt, C.A. Selcher, C.J. Heinselman, Comprehensive Studies of Langmuir Turbulence Experiments at HAARP, AGU Fall Meeting, 2008.

    53. Oyama, S. and B. J. Watkins, Aspect sensitivity of the first 100 ms HF-modification measured with the MUIR at HAARP, 13th EISCAT workshop, 2007.

    54. Oyama, S., S. Maeda, H. Shinagawa, and B. J. Watkins, Physical mechanism to generate vertical motions in the polar lower thermosphere, 13th EISCAT workshop, 2007.

    55. Fujii, R., H. Handa, S. Nozawa, and S. Oyama, Dependence of the electromagnetic and precipitating particle energy inputs to the ionosphere upon the sunlit/shade condition of the ionosphere, 13th EISCAT workshop, 2007.

    56. T. T. Tsuda, S. Nozawa, S. Oyama, T. Motoba, Y. Ogawa, H. Shinagawa, R. Fujii, The Neutral Wind in the Polar Lower Thermosphere Observed during the Strong Ionospheric Convection, International CAWSES Symposium, 2007.

    57. J. Kurihara, S. Oyama, S. Nozawa, R. Fujii, Y. Ogawa, N. Iwagami, T. Abe, DELTA Campaign: Coordinated Rocket and Ground-based Observations, International CAWSES Symposium, 2007.

    58. S. Maeda, Y. Ogawa, S. Nozawa, S. Oyama, K. Hosokawa, A. Brekke, Ion Heating within an Enhanced Westward Convection Channel in the Dusk-side Ionosphere, International CAWSES Symposium, 2007.

    59. S. Oyama, T. Watanabe, R. Fujii, S. Nozawa, Estimation of the Polar Ionospheric Conductance Using Data from the EISCAT Radar and the Multi-wavelengths Photometer, International CAWSES Symposium, 2007.

    60. J. P. Sheerin, Gerres, J M, Bacon, M E, Watkins, B J., Bristow, W A., Turnquist, J E, Oyama, S I, Heinselman, C J, UHF and HF Radar Studies of Langmuir Turbulence Experiments at HAARP, AGU Fall Meeting, 2007.

    61. S. Oyama, and B. J. Watkins, Aspect angle dependency of the HF modification measured with MUIR at HAARP, AGU Fall Meeting, 2007.

    62. Sheerin, J. P., J.M. Gerres, M.E. Bacon, B.J. Watkins, W.A. Bristow, S. Oyama, C.J. Heinselman, K.M. Groves, Ionospheric Interaction Experiments With Gigawatts, Bulletin of the American Physical Society, Orland, FL, 2007.

    63. Oyama, S., B. J. Watkins, R. T. Parris, and C. J. Heinselman, Initial high-range resolution results using MUIR at HAARP, RF Ionospheric Interaction Workshop, 2006.

    64. B. J. Watkins, S. Oyama, R. T. Parris, and C. J. Heinselman, Enhanced ion-line data from MUIR experiments at HAARP: Spectral asymmetries, RF Ionospheric Interaction Workshop, 2006.

    65. Sheerin, J. P., S. Oyama, B.J. Watkins, W.A. Bristow, Studies of strong Langmuir turbulence effects at HAARP, Bulletin of the American Physical Society, Philadelphia, Pennsylvania, 2006.

    66. Oyama, S., B. J. Watkins, and F. T. Djuth, HF induced plasma lines measured with the HAARP AMISR during January/February 2005 campaign, RF ionospheric interaction workshop, 2005.

    67. Oyama, S., B. J. Watkins, S. Maeda, S. Nozawa, C. Lathuillere, and W. Kofman, Methodology for estimation of the lower thermospheric wind with the incoherent-scatter radar, CEDAR workshop, 2005.

    68. Sheerin, J. P., R. Ilie, E.L. Roesler, W.A. Bristow, B.J. Watkins, S. Oyama, Results from UHF and HF Radar Studies of Ionospheric Interaction Experiments at HAARP, AGU Fall meeting, 2005.

    69. Oyama, S., B. J. Watkins, S. Nozawa, S. Maeda, and J. Watermann, Initial results of the lower thermospheric vertical wind estimated with incoherent-scatter radars at high latitudes, AGU Fall meeting, 2004.

    70. Oyama S., B. J. Watkins, and F. T. Djuth, Proposed future experimental plans using AMISR and VHF diagnostic radars at HAARP, RF Ionospheric Interaction Workshop, 2004.

    71. Oyama S., C. Lathuillere, S. Maeda, and B. J. Watkins, Ion temperature climate in the polar ionosphere using incoherent-scatter radars, AGU Fall meeting, 2003.

    72. Oyama S., B. J. Watkins, S. Maeda, and H. Shinagawa, Ion temperature maximum appeared in the polar E-F transition, CEDAR workshop, 2003.

    73. Nozawa, S., H. Iwahashi, Oyama S., Y. Murayama, A. Brekke, C. M. Hall, A. Manson, C. Meek, and R. Fujii, Mean wind and atmospheric tide observed at Tromsoe and Poker Flat, CEDAR workshop, 2003.

    74. Oyama, S., C. Lathuillere, S. Maeda, and B. J. Watkins, Effects of the ion composition ratio on the ion temperature in the polar E-F transition region, 11th EISCAT workshop, 2003.

    75. Adachi, K., R. Fujii, S. Nozawa, Y. Ogawa, T. Yamaguchi, S. Oyama, A. Brekke, C. Hall, and T. Ono, A comparison between energy parameters of precipitating electrons derived with the EISCAT UHF radar and a multi-wavelengths photometer, 11th EISCAT workshop, 2003.

    76. Nozawa, S., H. Iwahashi, A. Brekke, C. Hall, A. Manson, C. Meek, S. Oyama, Y. Murayama, M. Hagan, and R. Fujii, Mean winds and atmospheric tides observed at Tromsoe and Poker Flat, 11th EISCAT workshop, 2003.

    77. Oyama S., S. Nozawa, S. Maeda, Y. Murayama, R. Fujii, and H. Shinagawa, Field-aligned Ion Motions in the Transient Region between Polar Ionospheric E- and F-regions, AGU Fall Meeting, 2002.

    78. Shinagawa, H., and S. Oyama, MESOSCALE DYNAMICS ASSOCIATED WITH AURORAL ACTIVITIES IN THE POLAR THERMOSPHERE, COSPAR, 2002.

    79. Murayama, Y., M. Ishii, M. Kubota, H. Mori, S. Oyama, K. Igarashi, Collaboration between the RAO and CRL instrumentation at Poker Flat, 2001 CEDAR-SCOSTEP workshop, 2001.

    80. Oyama, S., T. Ogawa, M. Ishii, S. Nozawa, R. Fujii, S. Watari, E. Sagawa, and W. Kofman, Relations between GWs and TIDs simultaneously observed with the EISCAT radar and a scanning FPI (630.0 nm), The 10th International EISCAT Workshop, July, 2001.

    81. Ishii, M., S. Oyama, S. Nozawa, R. Fujii, M. Conde, R. W. Smith, M. Krynicki, E. Sagawa and S. Watari, Neutral Dynamics near Auroras Deduced From Fabry-Perot Interferometers at Ramfjordmoen and Poker Flat, The 10th International EISCAT Workshop, July, 2001.

    82. Murayama, Y., S. Oyama, W. Singer, and K. Igarashi, Comparative observation of mesospheric waves with MF radars at Poker Flat and Andenes, The 10th International EISCAT Workshop, July, 2001.

    83. Adachi, K., R. Fujii, S. Nozawa, T. Yamaguchi, S. Oyama, A. Brekke, and C. Hall, Derivation of the energy spectrum of precipitating electrons using EISCAT and multi-wavelengths photometer observations, The 10th International EISCAT Workshop, July, 2001.

    84. Oyama, S., M. Ishii, H. Shinagawa, M. Kubota, and Y. Murayama, Vertical winds observed with FPI in the auroral thermosphere in association with auroral activities, AP-RASC, August, 2001.

    85. Oyama, S., H. Shinagawa, M. Ishii, and M. Conde, Dynamic Responses in the Polar Thermosphere to Auroral Heating--Comparison of FPI Neutral Winds With a High-Resolution Two-Dimensional Model Results, AGU Fall meeting, 2001.

    86. Oyama, S., H. Shinagawa, S. C. Buchert, R. Fujii, S. Nozawa, M. Ishii, Y, Murayama, and W. Kofman, Effects of ionospheric heating on the neutral motions associated with an auroral arc, 33rd COSPAR, Warsaw, Poland, July, 2000.

    87. Shinagawa, H., S. Nozawa, S. C. Buchert, R. Fujii, M. Ishii, and S. Oyama, Thermospheric and ionospheric dynamics in the auroral region, 33rd COSPAR, Warsaw, Poland, July, 2000.

    88. Oyama, S., M. Ishii, H. Shinagawa, Y. Murayama, M. Kubota, S. Nozawa, and R. Fujii, Effects of thermal expansion on neutral vertical motions in the polar thermosphere, The first S-RAMP conference, Sapporo, October, 2000.

    89. Shinagawa, H., S. Oyama, M. Ishii, S. Nozawa, and R. Fujii, Thermosphere and ionosphere dynamics in the auroral region, The first S-RAMP conference, Sapporo, October, 2000.

    90. Oyama, S., S. Nozawa, S. C. Buchert, R. Fujii and M. Ishii, Effects of atmospheric oscillations on the filed-aligned ion motions in the polar F-region, The 9th International EISCAT Workshop, September, 1999.

    91. Ishii, M., S. Oyama, S. Nozawa, and R. Fujii, Neutral wind observations on EISCAT-FPI campaign, International Symposium on Dynamics and structure of the Mesopause Region, March, 1998.

    92. Ishii, M., S. Oyama, S. Nozawa, and R. Fujii, Neutral wind dinamics near auroral arc deduced from EISCAT-FPI campaign results, the 32nd COSPAR, July, 1998.

    93. Ishii, M., E. Sagawa, S. Watari, S. Oyama, S. Nozawa, and R. Fujii, Comparison Between Neural and Ion Velosoties in the Polar Thermosphere, AGU Fall meeting, December, 1998.

    94. Oyama, S., T. Imai, S. Nozawa, R. Fujii, S. C. Buchert, M. Ishii, H. Mori, and I. Iwamoto, The simultaneous observations of the thermospheric neutral winds with FPIs and EISCAT radars in January and February, 1997, The 8th International EISCAT Workshop, June, 1997.

    95. Ishii, M., Nozawa, S., S. Oyama, S. Okano, and R. Fujii, Wind structures near auroral arc deduced from observations of two different wave length emissions with FPI, The 8th International EISCAT Workshop, June, 1997.

    96. Ishii, M., S. Nozawa, S. Oyama, Spatial and Temporal Variations of Winds in the Lower Thermosphere near Auroral arc --Preliminary Results--, 8th Scientific Assembly of International Association of Geomagnetism and Aeronomy, August, 1997.

    97. Oyama, S., O. Takai, Influence of gas pressure on electrical and optical properties of InN thin films prepared by reactive sputtering, JIM, TMS, ASM, KIM, ISIJ,MMIJ, December, 1995.

     

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