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Publication list

 

peer-reviewed publication

First author

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  1. Oyama, S., Vanhamäki, H., Cai, L., Shinbori, A., Hosokawa, K., Sakanoi, T., et al. (2024). Thermospheric wind response to March 2023 storm: Largest wind ever observed with a Fabry‐Perot interferometer in Tromsø, Norway since 2009. Space Weather, 22, e2023SW003728. https://doi.org/10.1029/2023SW003728

  2. Oyama, S., Hosokawa, K., Vanhamäki,H., Aikio, A., Sakanoi, T., Cai, L., et al. (2023). IMF dependence of midnight bifurcation in the thermospheric wind at an auroral latitude based on nine winter measurements in Tromsø, Norway. Geophysical Research Letters, 50, e2023GL104334. https://doi.org/10.1029/2023GL104334

  3. Oyama, S., Aikio, A., Sakanoi, T. et al. Geomagnetic activity dependence and dawn-dusk asymmetry of thermospheric winds from 9-year measurements with a Fabry–Perot interferometer in Tromsø, Norway. Earth Planets Space 75, 70 (2023). https://doi.org/10.1186/s40623-023-01829-0

  4. Oyama, Si., Vanhamäki, H., Cai, L. et al. Thermospheric wind response to a sudden ionospheric variation in the trough: event at a pseudo-breakup during geomagnetically quiet conditions. Earth Planets Space 74, 154 (2022). https://doi.org/10.1186/s40623-022-01710-6

  5. Oyama, S., Shinbori, A., Ogawa, Y., Kellinsalmi, M., Raita, T., Aikio, A., et al. (2020). An ephemeral red arc appeared at 68° MLat at a pseudo breakup during geomagnetically quiet conditions. Journal of Geophysical Research: Space Physics, 125, e2020JA028468. https://doi.org/10.1029/2020JA028468

  6. 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.

  7. 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

  8. 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.

  9. 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

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. 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.

  20. 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.

  21. 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.

  22. 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.

  23. 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.

  24. 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.

  25. 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. Ellahouny, N. M., Aikio, A. T., Vanhamäki, H., Virtanen, I. I., Cai, L., Marchaudon, A., et al. (2024). EISCAT observations of depleted high-latitude F-region during an HSS/SIR-driven magnetic storm. Journal of Geophysical Research: Space Physics, 129, e2024JA032910. https://doi.org/10.1029/2024JA032910

  2. Cai, L., Aikio, A., Oyama, S., Ivchenko, N., Vanhamäki, H., Virtanen, I., et al. (2024). Effect of polar cap patches on the high-latitude upper thermospheric winds. Journal of Geophysical Research: Space Physics, 129, e2024JA032819. https://doi.org/10.1029/2024JA032819

  3. Ito, Y., Hosokawa, K., Ogawa, Y., Miyoshi, Y., Tsuchiya, F., Fukizawa, M., et al. (2024). On the factors controlling the relationship between type of pulsating aurora and energy of pulsating auroral electrons: Simultaneous observations by Arase satellite, ground-based all-sky imagers and EISCAT radar. Journal of Geophysical Research: Space Physics, 129, e2024JA032617. https://doi.org/10.1029/2024JA032617

  4. Kato, Y., Shiokawa, K., Tanaka, Y., Ozaki, M., Kadokura, A., Oyama, S.-i., et al. (2024). Spatiotemporal development of cosmic noise absorption at subauroral latitudes using multipoint ground-based riometers. Journal of Geophysical Research: Space Physics, 129, e2023JA032206. https://doi.org/10.1029/2023JA032206

  5. Chauhan, N., Shiokawa, K., Gurubaran, S., Nozawa, S., Oyama, S.-i., & Nakamura, T. (2024). Occurrence of mesospheric frontal structures over the high latitude station, Tromsø, Norway. Journal of Geophysical Research: Space Physics, 129, e2023JA032243. https://doi.org/10.1029/2023JA032243

  6. Chen, R., Y. Miyoshi, X. Gao, Q. Lu, B. Tsurutani, K. Hosokawa, H. Chen, T. Hori, Y. Ogawa, S. Oyama, Y. Kasahara, S. Matsuda, S. Nakamura, A. Matsuoka, and I. Shinohara (2024), Observational evidence for 1 three time-scale modulations in the pulsating aurora, Geophysical Research Letters, 51, e2024GL108253. https://doi.org/10.1029/2024GL108253

  7. Yin, Z.-F., Zhou, X.-Z., Hu, Z.-J., Yue, C., Zong, Q.-G., Liu, Z.-Y., et al. (2024). Westward excursion of Pc1/EMIC waves and their source protons: Paradoxical observations from ground and space. Journal of Geophysical Research: Space Physics, 129, e2023JA032317. https://doi.org/10.1029/2023JA032317

  8. Sato, M., Shiokawa, K., Oyama, S.-i., Otsuka, Y., Shinbori, A., & Oksanen, A. (2024). Statistical analysis of low-latitude boundary of polar-type medium-scale traveling ionospheric disturbances observed by a 630-nm airglow imager at Nyrölä, Finland. Journal of Geophysical Research: Space Physics, 129, e2023JA032077. https://doi.org/10.1029/2023JA032077

  9. Kato, Y., K. Shiokawa, Y. Tanaka, M. Ozaki, A. Kadokura, S. Oyama, A. Oinats, M. Connors, and D. Baishev (2023), Longitudinal development of cosmic noise absorption based on multipoint observations at subauroral latitudes during storm-time substorms on August 25-28, 2018, Journal of Geophysical Research: Space Physics, 128, e2023JA031950. https://doi.org/10.1029/2023JA031950

  10. Chen, L., Shiokawa, K., Miyoshi, Y., Oyama, S., Jun, C.-W., Ogawa, Y., et al. (2023). Correspondence of Pi2 pulsations, aurora luminosity, and plasma flux fluctuation near a substorm brightening aurora: Arase observations. Journal of Geophysical Research: Space Physics, 128, e2023JA031648. https://doi.org/10.1029/2023JA031648

  11. Nanjo, S., Ebukuro, S., Nakamura, S., Miyoshi, Y., Kurita, S., Oyama, S.-i., et al. (2023). An implication of detecting the internal modulation in a pulsating aurora: A conjugate observation by the Arase satellite and all-sky imagers. Journal of Geophysical Research: Space Physics, 128, e2023JA031499. https://doi.org/10.1029/2023JA031499

  12. Hosokawa, K., Oyama, S.-I., Ogawa, Y., Miyoshi, Y., Kurita, S., Teramoto, M., et al. (2023). A ground-based instrument suite for integrated high-time resolution measurements of pulsating aurora with Arase. Journal of Geophysical Research: Space Physics, 128, e2023JA031527. https://doi.org/10.1029/2023JA031527

  13. Tian, X., Y. Yu, F. Gong, L. Ma, J. Cao, S. C. Solomon, P. R. Shreedevi, K. Shiokawa, Y. Otsuka, S. Oyama, Y. Miyoshi (2023), Ionospheric modulation by EMIC wave-driven proton precipitation: Observations and simulations. Journal of Geophysical Research: Space Physics, 128, e2022JA030983. https://doi.org/10.1029/2022JA030983

  14. Kawai, K., K. Shiokawa, Y. Otsuka, S. Oyama, M. G. Connors, Y. Kasahara, Y. Kasaba, S. Nakamura, F. Tsuchiya, A. Kumamoto, A. Shinbori, A. Matsuoka, I. Shinohara, and Y. Miyoshi (2023), Multi-event analysis of magnetosphere-ionosphere coupling of nighttime medium-scale traveling ionospheric disturbances from the ground and the Arase satellite. Journal of Geophysical Research: Space Physics, 128, e2022JA030542. https://doi.org/10.1029/2022JA030542

  15. Liu, J., K. Shiokawa, S. Oyama, Y. Otsuka, C. W. Jun, M. Nose, T. Nagatsuma, K. Sakaguchi, A. Kadokura, M. Ozaki, M. Connors, D. Baishev, N. Nishitani, A. Oinats, V. Kurkin and T. Raita (2023), A statistical study of longitudinal extent of Pc1 pulsations using seven PWING ground stations at subauroral latitudes. Journal of Geophysical Research: Space Physics, 128, e2021JA029987. https://doi.org/10.1029/2021JA029987

  16. Chen, L., K. Shiokawa, Y. Miyoshi, S. Oyama, C-W. Jun, Y. Ogawa, K. Hosokawa, Y. Inaba, Y. Kazama, S. Y. Wang, S. W. Y. Tam, T. F. Chang, B. J. Wang, K. Asamura, S. Kasahara, S. Yokota, T. Hori, K. Keika, Y. Kasaba, A. Kumamoto, F. Tsuchiya, M. Shoji, Y. Kasahara, A. Matsuoka, I. Shinohara, S. Imajo, S. Nakamura, M. Kitahara (2022), Observation of source plasma and field variations of a substorm brightening aurora at L~6 by a ground-based camera and the Arase satellite on 12 October 2017, Journal of Geophysical Research: Space Physics, 127, e2021JA030072. https://doi.org/10.1029/2021JA030072

  17. Ozaki, M, S. Yagitani, K. Shiokawa, Y. Tanaka, Y. Ogawa, K. Hosokawa, Y. Kasahara, Y. Ebihara, Y. Miyoshi, K. Imamura, R. Kataoka, S. Oyama, T. Chida, A. Kadokura (2022). Slow contraction of flash aurora induced by an isolated chorus element ranging from lower-band to upper-band frequencies in the source region. Geophysical Research Letters, 49, e2021GL097597. https://doi.org/10.1029/2021GL097597

  18. Yamauchi, M., De Keyser, J., Parks, G., Oyama, S., et al. Plasma-neutral gas interactions in various space environments: Assessment beyond simplified approximations as a Voyage 2050 theme. Exp Astron (2022). https://doi.org/10.1007/s10686-022-09846-9

  19. Safargaleev, V.T. Sergienko, K. Hosokawa, S.-I. Oyama, Y. Ogawa, Y. Miyoshi, S. Kurita and R. Fujii (2022), Altitude of pulsating arcs as inferred from tomographic measurements. Earth Planets Space 74, 31 (2022). https://doi.org/10.1186/s40623-022-01592-8

  20. Yadav, S., Shiokawa, K., Oyama, S., Inaba, Y., Takahashi, N., Seki, K., et al. (2021). Study of an equatorward detachment of auroral arc from the oval using ground-space observations and the BATS-R-US–CIMI model. Journal of Geophysical Research: Space Physics, 126, e2020JA029080. https://doi.org/10.1029/2020JA029080

  21. Matsuda, S., Y. Miyoshi, Y. Kasahara, L. Blum, C. Colpitts, K. Asamura, Y. Kasaba, A. Matsuoka, F. Tsuchiya, A. Kumamoto, M. Teramoto, S. Nakamura, M. Kitahara, I. Shinohara, G. Reeves, H. Spence, K. Shiokawa, T. Nagatsuma, S. Oyama, I. Mann (2021), Multipoint Measurement of Fine-Structured EMIC Waves by Arase, Van Allen Probe A and Ground Stations, Geophysical Research Letters, 48, e2021GL096488. https://doi.org/10.1029/ 2021GL096488

  22. Kawamura, M., Sakanoi, T., Fukizawa, M., Miyoshi, Y., Hosokawa, K., Tsuchiya, F., Katoh, Y., Ogawa, Y., Asamura, K., Saito, S., Spence, H., Johnson, A., Oyama, S., Brändström, U. (2021). Simultaneous pulsating aurora and microburst observations with ground-based fast auroral imagers and CubeSat FIREBIRD-II. Geophysical Research Letters, 48, e2021GL094494. https://doi.org/10.1029/2021GL094494

  23. Nanjo, S., Hozumi, Y., Hosokawa, K., Kataoka, R., Miyoshi, Y., Oyama, S.-i., et al. (2021). Periodicities and colors of pulsating auroras: DSLR camera observations from the International Space Station. Journal of Geophysical Research: Space Physics, 126, e2021JA029564. https://doi.org/10.1029/2021JA029564

  24. Verronen, P. T., Kero, A., Partamies, N., Szeląg, M. E., Oyama, S.-I., Miyoshi, Y., and Turunen, E.: Simulated seasonal impact on middle atmospheric ozone from high-energy electron precipitation related to pulsating aurorae, Ann. Geophys., 39, 883–897, https://doi.org/10.5194/angeo-39-883-2021, 2021.

  25. Kim, H., K. Shiokawa, J. Park, Y. Miyoshi, Y. Miyashita, C. Stolle, H. K. Connor, J. Hwang, S. Buchert, H.-J. Kwon, S. Nakamura, K. Nakamura, S. Oyama, Y. Otsuka, T. Nagatsuma, and K. Sakaguchi (2021), Isolated Proton Aurora Driven by EMIC Pc1 Wave: PWING, Swarm, and NOAA POES Multi-Instrument Observations, Geosphs. Res. Let., https://doi.org/10.1029/2021GL095090.

  26. Miyamoto, T., Oyama, S.-i., Raita, T., Hosokawa, K., Miyoshi, Y., Ogawa, Y., & Kurita, S. (2021). Variations in cosmic noise absorption in association with equatorward development of the pulsating auroral patch: A case study to estimate the energy spectra of auroral precipitating electrons. Journal of Geophysical Research: Space Physics, 126, e2021JA029309. https://doi.org/10.1029/2021JA029309.

  27. Kawai, K., K. Shiokawa, Y. Otsuka, S. Oyama, Y. Kasaba, Y. Kasahara, F. Tsuchiya, A. Kumamoto, S. Nakamura, A. Matsuoka, S. Imajo, Y. Kazama, Shiang-Yu, Wang, Sunny W. Y. Tam, T. F. Chang, B. J. Wang, K. Asamura, S. Kasahara, S. Yokota, K. Keika, T. Hori, Y. Miyoshi, C. Jun, M. Shoji, and I. Shinohara (2021). First simultaneous observation of a nighttime medium-scale traveling ionospheric disturbance from the ground and a magnetospheric satellite, J. Geophys. Res., 126, https://doi.org/10.1029/2020JA029086.

  28. Miyoshi, Y., Hosokawa, K., Kurita, S., Oyama, S., et al. Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae. Sci Rep 11, 13724 (2021). https://doi.org/10.1038/s41598-021-92611-3.

  29. Ozaki, M., Inoue, T., Tanaka, Y., Yagitani, S., Kasahara, Y., Shiokawa, K., Miyoshi, Y., Imamura, K., Hosokawa, K., Oyama, S., Kataoka R., Ebihara, Y., Ogawa, Y. and Kadokura A. (2021). Spatial evolution of wave-particle interaction region deduced from flash-type auroras and chorus-ray tracing. Journal of Geophysical Research: Space Physics, 126, e2021JA029254. https://doi.org/10.1029/2021JA029254.

  30. Inaba, Y., K. Shiokawa1, S. Oyama et al. (2021), Multi-event Analysis of Plasma and Field Variations in Source of Stable Auroral Red (SAR) Arcs in Inner Magnetosphere during Non-storm-time Substorms, Journal of Geophysical Research: Space Physics, 126, https://doi.org/10.1029/2020JA029081.

  31. Hosokawa, K., Y. Miyoshi, S.-I. Oyama, Y. Ogawa, S. Kurita, Y. Kasahara, Y. Kasaba, S. Yagitani, S. Matsuda, M. Ozaki, F. Tsuchiya, A. Kumamoto, T. Takashima, I. Shinohara, and R. Fujii (2021), Over-darkening of pulsating aurora, Journal of Geophysical Research: Space Physics, 126, https://doi.org/10.1029/2020JA028838.

  32. Narayanan, V. L., Nozawa, S., Oyama, S.-I., Mann, I., Shiokawa, K., Otsuka, Y., Saito, N., Wada, S., Kawahara, T. D., and Takahashi, T.: Formation of an additional density peak in the bottom side of the sodium layer associated with the passage of multiple mesospheric frontal systems, Atmos. Chem. Phys., 21, 2343–2361, https://doi.org/10.5194/acp-21-2343-2021, 2021.

  33. Takeshita Y., K. Shiokawa, Y. Miyoshi, M. Ozaki, Y. Kasahara, S. Oyama, M. Connors, J. Manninen, V. K. Jordanova, D. Baishev, A. Oinats, and V. Kurkin (2020), Study of spatiotemporal development of global distribution of magnetospheric ELF/VLF waves using ground-based and satellite observations, and RAM-SCB simulations, for the March and November 2017 storms, J. Geophys. Res., 125, https://doi.org/10.1029/2020JA028216.

  34. Tsuda, T. T., Li, C., Hamada, S., Hosokawa, K., Oyama, S., Nozawa, S., et al. (2020). OI 630.0‐nm and N2 1PG emissions in pulsating aurora events observed by an optical spectrograph at Tromsø, Norway. Journal of Geophysical Research: Space Physics, 125, e2020JA028250. https://doi.org/10.1029/2020JA028250

  35. Miyoshi, Y., Saito, S., Kurita, S., Asamura, K., Hosokawa, K., Sakanoi, T., Mitani, T., Ogawa, Y., Oyama, S., Tsuchiya, F., Jones, S. L., Jaynes, A. N., Blake, J. B. (2020). Relativistic electron microbursts as high‐energy tail of pulsating aurora electrons. Geophysical Research Letters, 47, e2020GL090360. https://doi.org/10.1029/2020GL090360

  36. Inaba Y., K. Shiokawa, S. Oyama, Y. Otsuka, A. Oksanen, A. Shinbori, A. Yu. Gololobov, Y. Miyoshi, Y. Kazama, S.-Y. Wang, S. W. Y. Tam, T.-F. Chang, B.-J. Wang, S. Yokota, S. Kasahara, K. Keika, T. Hori, A. Matsuoka, Y. Kasahara, A. Kumamoto, Y. Kasaba, M. Shoji, I. Shinohara, and C. Stolle, Plasma and field observations in the magnetospheric source region of a stable auroral red (SAR) arc by the Arase satellite on 28 March 2017, J. Geophys. Res., 125, https://doi.org/10.1029/2020JA028068, 2020.

  37. Kawamura, Y., Hosokawa, K., Nozawa, S., Oyama, S., et al. Estimation of the emission altitude of pulsating aurora using the five-wavelength photometer. Earth Planets Space 72, 96 (2020). https://doi.org/10.1186/s40623-020-01229-8

  38. Hosokawa, K., Y. Miyoshi, M. Ozaki, S.-I. Oyama, Y. Ogawa, S. Kurita, Y. Kasahara, Y. Kasaba, S. Yagitani, S. Matsuda, F. Tsuchiya, A. Kumamoto, R. Kataoka, K. Shiokawa, T. Raita, E. Turunen, T. Takashima, I. Shinohara & R. Fujii, Multiple time-scale beats in aurora: precise orchestration via magnetospheric chorus waves. Nature Sci Rep 10, 3380 (2020). https://doi.org/10.1038/s41598-020-59642-8

  39. Nanjo, S., Hozumi, Y., Hosokawa, K., Kataoka, R., Miyoshi, Y., & Oyama, S.-i. (2020). Fine-scale visualization of aurora in a wide area using color digital camera images from the International Space Station. J. Geophys. Research: Space Physics, 125, e2019JA027729. https://doi.org/10.1029/2019JA027729

  40. Yadav, S., K. Shiokawa, S. Oyama and Y. Otsuka, Multi-event analysis of oscillatory motion of medium-scale traveling ionospheric disturbances observed by a 630-nm airglow imager over Tromsø, J. Geophys. Research: Space Physics, DOI: 10.1029/2019JA027598, 2020.

  41. 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.

  42. Ogawa, Y., Y. Tanaka, A. Kadokura, K. Hosokawa, Y. Ebihara, T. Motoba, B. Gustavsson, U. Brändström, Y. Sato, S. Oyama, M. Ozaki, T. Raita, F. Sigernes, S. Nozawa, K. Shiokawa, M. Kosch, K. Kauristi, C. Hall, S. Suzuki, Y. Miyoshi, A. Gerrard, H. Miyaoka, R. Fujiit, Development of low-cost multi-wavelength imager system for studies of aurora and airglow, Polar Science, 23, 100501, https://doi.org/10.1016/j.polar.2019.100501, 2020.

  43. 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

  44. 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.

  45. 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.

  46. 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.

  47. 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.

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  49. 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

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  55. 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.

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  59. 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.

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  61. 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.

  62. 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.

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  64. 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.

  65. 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.

  66. 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.

  67. 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.

  68. 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.

  69. 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.

  70. 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.

  71. 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.

  72. 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.

  73. 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.

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  75. 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.

  76. 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.

  77. 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.

  78. 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.

  79. 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.

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  81. 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.

  82. 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.

  83. 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.

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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.

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