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Peer-Reviewed Paper

Peer-Reviewed Paper

2026

  • Nykiel, G., Kanska, J., Sato, H., Oyama, S.-i., Shiokawa, K., & Themens, D. R. (2026). Auroral effect on mid-latitude ionospheric disturbances over Europe during the extreme geomagnetic storm of 10 May 2024. Space Weather, 24, e2026SW005133. https://doi.org/10.1029/2026SW005133
  • Oyama, S., H. Vanhamäki, L. Cai, K. Hosokawa, K. Shiokawa, and T. Sakanoi (2026). Dynamics of high-latitude energy conversion in the upper thermosphere based on 9-year measurements from FPI and Dynasonde in Tromsø, Norway. Journal of Geophysical Research: Space Physics, 131, e2026JA035076. https://doi.org/10.1029/2026JA035076
  • Kikuchi, T., Shiokawa, K., Oyama, Si. et al. First attempt of Doppler velocity measurement for molecular nitrogen ion through auroral 427.8-nm emission by a Fabry–Perot interferometer in Norway. Earth Planets Space 78, 100 (2026). https://doi.org/10.1186/s40623-026-02419-6
  • Cai, L., Aikio, A., Geethakumari, G. P., Vanhamäki, H., Virtanen, I. I., Oyama, S.-i., et al. (2026). Ionosphere-thermosphere coupling in the Northern polar region during the May 2024 geomagnetic superstorm. Journal of Geophysical Research: Space Physics, 131, e2025JA034495. https://doi.org/10.1029/2025JA034495
  • Hosokawa, K., Kurita, S., Miyoshi, Y., Oyama, S.-I., Ogawa, Y., Ozaki, M., et al. (2026). Circularly expanding ring-shaped pulsating aurora visualizing the source of plasma waves in space. AGU Advances, 7, e2026AV002300. https://doi.org/10.1029/2026AV002300
  • Nanjo, S., Brändström, U., Nozawa, S. et al. Calibration and observations of an AI-triggered commercial digital camera for auroral studies. Earth Planets Space 78, 112 (2026). https://doi.org/10.1186/s40623-026-02451-6
  • Nishitani, N., Hosokawa, K., Hori, T., Teramoto, M., Ponomarenko, P. V., Shinbori, A., et al. (2026). “Caterpillar” ULF waves in the dusk side sub-auroral region: Conjugate observations with SuperDARN, Arase and ground magnetometers. Journal of Geophysical Research: Space Physics, 131, e2025JA034819. https://doi.org/10.1029/2025JA034819
  • JJiménez, J.PC., Ivchenko, N., Sergienko, T. et al. Detection of pulsating aurora from GNSS total electron content. Earth Planets Space 78, 68 (2026). https://doi.org/10.1186/s40623-026-02405-y
  • Nanjo, S., Herlingshaw, K., Sergienko, T., Cessateur, G., Partamies, N., Johnsen, M. G., Hosokawa, K., Lamy, H., Ogawa, Y., Kero, A., Oyama, S., and Yamauchi, M.: Observations of fragmented aurora-like emissions and picket fence on the poleward edge of the auroral oval, Ann. Geophys., 44, 63–84, https://doi.org/10.5194/angeo-44-63-2026, 2026.

2025

  • Oyama, S., Virtanen, I. I., Tesfaw, H. W., Raita, T., Holappa, L., Miyoshi, Y., et al. (2025). Geomagnetic activity dependence of the auroral electron precipitation spectrum at high latitudes. Journal of Geophysical Research: Space Physics, 130, e2024JA033441. https://doi.org/10.1029/2024JA033441
  • Nanjo, S., Yamauchi, M., Johnsen, M. G., Yokoyama, Y., Brändström, U., Ogawa, Y., Willer, A. N., and Hosokawa, K.: Leaping and vortex motion of the shock aurora toward the late evening sector observed on 26 February 2023, Ann. Geophys., 43, 303–317, https://doi.org/10.5194/angeo-43-303-2025, 2025.
  • Pérez-Coll Jiménez, J., Ivchenko, N., Sergienko, T., Strelnikov, B., Hedin, J., Whiter, D. K., et al. (2025). Ionospheric plasma parameters measured by SPIDER-2 sounding rocket during a pulsating Aurora event. Journal of Geophysical Research: Space Physics, 130, e2024JA032939. https://doi.org/10.1029/2024JA032939

2024

  • 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
  • Geethakumari, G. P., A. T. Aikio, L. Cai, H. Vanhamäki, I. I. Virtanen, A. Coster, A. Marchaudon, P.-L. Blelly, A. Maute, J. Norberg, S. Oyama, Y. Zhang, B. S. R. Kunduri (2024). Total electron content variations during an HSS/SIR-driven geomagnetic storm at high and mid latitudes. Journal of Geophysical Research: Space Physics, 129, e2024JA033192. https://doi.org/10.1029/2024JA033192
  • 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
  • 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
  • Hosokawa, K., Miyoshi, Y., Mcharg, M., Ledvina, V., Hampton, D., Lessard, M., et al. (2024). Variation of the altitude of auroral emission during a substorm cycle: Stereoscopic optical observations during the LAMP rocket experiment. Journal of Geophysical Research: Space Physics, 129, e2024JA033036. https://doi.org/10.1029/2024JA033036
  • Keisuke Hosokawa et al. ,Exceptionally gigantic aurora in the polar cap on a day when the solar wind almost disappeared.Sci. Adv.10,eadn5276(2024). DOI:10.1126/sciadv.adn5276
  • to, 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
  • Nanjo, S., Hofstra, G.A., Shiokawa, K. et al. Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE?. Earth Planets Space 76, 55 (2024). https://doi.org/10.1186/s40623-024-01995-9
  • Nosé, M., Hosokawa, K., Nomura, R., Teramoto, M., Asamura, K., Miyoshi, Y., et al. (2024). Field-aligned currents associated with pulsating auroral patches: Observation with magneto-impedance magnetometer (MIM) onboard loss through auroral microburst pulsations (LAMP) sounding rocket. Journal of Geophysical Research: Space Physics, 129, e2023JA032232. https://doi.org/10.1029/2023JA032232

2023

  • 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
  • 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
  • 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
  • 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
  • Namekawa, T., Mitani, T., Asamura, K., Miyoshi, Y., Hosokawa, K., Lessard, M., et al. (2023). Simultaneous precipitation of sub-relativistic electron microburst and pulsating aurora electrons. Geophysical Research Letters, 50, e2023GL104001. https://doi.org/10.1029/2023GL104001

2022

  • 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
  • Nanjo, S., Nozawa, S., Yamamoto, M. et al. An automated auroral detection system using deep learning: real-time operation in Tromsø, Norway. Sci Rep 12, 8038 (2022). https://doi.org/10.1038/s41598-022-11686-8

2021

  • Hosokawa, K., Miyoshi, Y., Oyama, S.-I., Ogawa, Y., Kurita, S., Kasahara, Y., et al. (2021). Over-darkening of pulsating aurora. Journal of Geophysical Research: Space Physics, 126, e2020JA028838. https://doi.org/10.1029/2020JA028838

2020

  • 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
  • Hosokawa, K., Miyoshi, Y., Ozaki, M. et al. Multiple time-scale beats in aurora: precise orchestration via magnetospheric chorus waves. Sci Rep 10, 3380 (2020). https://doi.org/10.1038/s41598-020-59642-8
  • 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. Kauristie, C. Hall, S. Suzuki, Y. Miyoshi, A. Gerrard, H. Miyaoka, R. Fujii, Development of low-cost multi-wavelength imager system for studies of aurora and airglow, Polar Science, Volume 26, doi:10.1016/j.polar.2019.100501, March, 2020.

2019

  • 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
  • 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.
  • 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
  • Hosokawa, K., Zou, Y. & Nishimura, Y. Airglow Patches in the Polar Cap Region: A Review. Space Sci Rev 215, 53 (2019). https://doi.org/10.1007/s11214-019-0616-8
  • Hosokawa, K., Ogawa, Y. & Taguchi, S. Imaging of polar cap patches with a low-cost airglow camera: pilot observations in Svalbard, Norway. Earth Planets Space 71, 115 (2019). https://doi.org/10.1186/s40623-019-1094-7