Peer-reviewed papers

1. Sitnov, M. I., G. K. Stephens, T. Motoba, and N. A. Tsyganenko (2025), The substorms of February 26, 2008: A data-mining perspective, Geophysical Research Letters, 52, e2025GL116865. https://doi.org/10.1029/2025GL116865.

2. Motoba, T., Y. Ebihara, and Y. Ogawa (2025). Dayside Shock Aurora at the Beginning of the May 2024 Superstorm: South Pole-THEMIS Spacecraft Conjunction. Journal of Geophysical Research: Space Physics, 130, e2025JA034054. https://doi.org/10.1029/2025JA034054.

3. Sitnov, M. I., G. K. Stephens, A. V. Artemyev, T. Motoba, and N. A. Tsyganenko (2025). Global structure of the cislunar magnetotail and its evolution during substorms,  Journal of Geophysical Research - Space Physics, 130, e2025JA034018. https://doi.org/10.1029/2025JA034018.

4. Zhang, Y., Motoba, T., L. Paxton, and R. Schaefer (2025). Double auroral undulation during the main phase of the May 10-11, 2024 storm, AGU Advances, 6, e2025AV001688. https://doi.org/10.1029/2025AV001688

5. Motoba, T., & Ohtani, S. (2025). Species-dependent and azimuthally-directional flux changes of dispersionless ion injections inside geosynchronous orbit. Journal of Geophysical Research: Space Physics, 130, e2025JA033757. https://doi.org/10.1029/2025JA033757.

6. Ohtani, S., & Motoba, T. (2024). Auroral bead propagation: Explanation based on the conservation of vorticity. Journal of Geophysical Research: Space Physics, 129, e2024JA032904. https://doi.org/10.1029/2024JA032904

7. Ohtani, S., & T. Motoba (2022), Formation of Beading Auroral Arcs at Substorm Onset: Implications of Its Variability into the Generation Process. Journal of Geophysical Research: Space Physics, 127, e2022JA030796. https://doi.org/10.1029/2022JA030796

8. Motoba, T., Sitnov, M. I., Stephens, G. K., & Gershman, D. J. (2022). A New Perspective on Magnetotail Electron and Ion Divergent Flows: MMS Observations. Journal of Geophysical Research: Space Physics, 127, e2022JA030514. https://doi.org/10.1029/2022JA030514.

9. Ohtani, S., T. Motoba, J. Gjerloev, H. Frey, I. Mann, P. Chi, & H. Korth. (2022). New Insights into the Substorm Initiation Sequence from the Spatio-temporal Development of Auroral Electrojets, Journal of Geophysical Research: Space Physics, 127, e2021JA030114. https://doi.org/10.1029/2021JA030114

10. Motoba, T., S. Ohtani, M. Gkioulidou, A. Y. Ukhorskiy, L. J. Lanzerotti, and S., Claudepierre (2021), Superposed Epoch Analysis of Dispersionless Particle Injections Inside Geosynchronous Orbit, Journal of Geophysical Research: Space Physics, doi:10.1029/2021JA029546

11. Motoba, T., Y. Ogawa, Y. Ebihara, A. Kadokura, A. J. Gerrard, and A. T. Weatherwax (2021), Daytime Pc5 Diffuse Auroral Pulsations and Their Association With Outer Magnetospheric ULF Waves, Journal of Geophysical Research: Space Physics, https://doi.org/10.1029/2021JA029218.

12. Sitnov, M. I., T. Motoba, and M. Swisdak (2021), Multiscale nature of the magnetotail reconnection onset. Geophysical Research Letters, 48, e2021GL093065. https://doi.org/10.1029/2021GL093065.

13. Sitnov, M. I., G. K. Stephens, T. Motoba, and M. Swisdak (2021), Data Mining Reconstruction of Magnetotail Reconnection and Implications for Its First-Principle Modeling, Front. Phys., doi: 10.3389/fphy.2021.644884.

14. Takahashi, K., L. Turc, E. Kilpua, N. Takahashi, A. Dimmock, P. Kajdic, M. Palmroth, Y. Pfau-Kempf, J. Soucek, T. Motoba, et al. (2020), Propagation of Ultralow-Frequency Waves From the Ion Foreshock Into the Magnetosphere During the Passage of a Magnetic Cloud, Journal of Geophysical Research: Space Physics, 125, e2020JA028474. https://doi.org/10.1029/2020JA028474.

15. Motoba, T., Ohtani, S., Claudepierre, S. G., Reeves, G. D., Ukhorskiy, A. Y., & Lanzerotti, L. J. (2020). Dynamic Properties of Particle Injections Inside Geosynchronous Orbit: A Multi‐satellite Case Study. Journal of Geophysical Research: Space Physics, 125, e2020JA028215. doi:10.1029/2020JA028215

16. Ohtani, S., T. Motoba, T., Takahashi, K., & Califf, S. (2020). Generalized Substorm Current Wedge Model: Two Types of Dipolarizations in the Inner Magnetosphere. Journal of Geophysical Research: Space Physics, 125, e2020JA027890. https://doi.org/10.1029/2020JA027890.

17. Motoba, T., Ohtani, S., Gkioulidou, M., Mitchell, D. G., Ukhorskiy, A. Y., Takahashi, K., et al. (2020), Pitch Angle Dependence of Electron and Ion Flux Changes During Local Magnetic Dipolarization inside Geosynchronous Orbit, Journal of Geophysical Research: Space Physics, 125, e2019JA027543. https://doi.org/10.1029/2019JA027543.

18. 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, and R. Fujii (2019), Development of low-cost multi-wavelength imager system for studies of aurora and airglow, Polar Science, https://doi.org/10.1016/j.polar.2019.100501.

19. Sitnov, M. I., Stephens, G. K., Tsyganenko, N. A., Miyashita, Y., Merkin, V. G., Motoba, T., et al (2019). Signatures of non-ideal plasma evolution during substorms obtained by mining multi‐mission magnetometer data, Journal of Geophysical Research: Space Physics, 124. https://doi.org/10.1029/2019JA027037

20. Sitnov, M., J. Birn, B. Ferdousi, E. Gordeev, Y. Khotyaintsev, V. Merkin, T. Motoba, A. Otto, E. Panov, P. Pritchett, F. Pucci, J. Raeder, A. Runov, V. Sergeev, M. Velli, X. Zhou (2019), Explosive magnetotail activity, Space Sci. Rev., 215:31, https://doi.org/10.1007/s11214-019-0599-5. 

21. Motoba, T., Y. Ebihara, Y. Ogawa, A. Kadokura, M. J. Engebretson, V. Angelopoulos, A. J. Gerrard, and A. T. Weatherwax (2019), On the driver of daytime Pc3 auroral pulsations, Geophys. Res. Lett., 46, https://doi.org/10.1029/2018GL080842.

22. Imajo, S., M. Nose, A. Matsuoka, S. Kasahara, S. Yokota, M. Teramoto, K. Keika, T. Motoba, B. Anderson, R. Nomura, A. Fujimoto, I. Shinohara, and Y. Miyoshi (2018), Magnetosphere-ionosphere connection of storm-time Region-2 field-aligned current and ring current: Arase and AMPERE observations, Journal of Geophysical Research: Space Physics, 123, doi:10.1029/2018JA025865.

23. Ohtani, S., T. Motoba, Gjeroloev, J. W., Ruohoniemi, J. M., Donovan, E. F., & Yoshikawa, A. (2018). Longitudinal Development of Poleward Boundary Intensifications (PBIs) of Auroral Emission. Journal of Geophysical Research: Space Physics, 123, doi:10.1029/2017JA024375. 

24. Takahashi, K., R. E. Denton, T. Motoba, et al. (2018), Impulsively Excited Nightside Ultralow Frequency Waves Simultaneously Observed On and Off the Magnetic Equator, Geophys. Res. Lett., 45, 7918–7926. https://doi.org/10.1029/2018GL078731.

25. Motoba, T., S. Ohtani, M. Gkioulidou, A. Y. Ukhorskiy, D. G. Mitchell, K. Takahashi, L. J. Lanzerotti, C. A. Kletzing, H. E. Spence, and J. R. Wygant (2018), Response of Different Ion Species to Local Magnetic Dipolarization Inside Geosynchronous Orbit, J. Geophys. Res. Space Physics.

26. Ohtani, S., T. Motoba, M. Gkioulidou, K. Takahashi, and H. J. Singer (2018), Spatial Development of the Dipolarization Region in the Inner Magnetosphere, J. Geophys. Res. Space Physics.

27. Ohtani, S., and T. Motoba, (2017), Equatorial magnetic field of the near-Earth magnetotail, J. Geophys. Res. Space Physics.

28. Motoba, T., et al., Fast-moving diffuse auroral patches: A new aspect of daytime Pc3 auroral pulsations, J. Geophys. Res. Space Physics, 120, doi:10.1002/2016JA023285, 2017.

29. Motoba, T., and M. Hirahara, High-resolution auroral acceleration signatures within a highly dynamic onset arc, Geophys. Res. Lett., 43, doi:10.1002/2015GL067580, 2016.

30. Sato, N., A. Kadokura, T. Motoba, K. Hosokawa, G. Bjornsson, and Th. Saemundsson, Interhemispheric auroral symmetry and asymmetry from ground-based conjugate observations, AGU Book series "Aurora Dynamics and Space Weather", 2015.

31. Motoba, T., et al., On the formation and origin of substorm growth phase/onset auroral arcs inferred from conjugate space-ground observations, J. Geophys. Res. Space Physics, 120, doi:10.1002/2014JA021676, 2015.

32. Motoba, T., K. Takahashi, J. V. Rodriguez, and C. T. Russell, Giant pulsations on the afternoon side: Geostationary satellite and ground observations, J. Geophys. Res. Space Physics, 120, doi:10.1002/2015JA021592, 2015.

33. Motoba, T., et al., Link between pre-midnight second harmonic poloidal waves and auroral undulations: Conjugate observations with a Van Allen Probes spacecraft and a THEMIS all-sky imager, J. Geophys. Res. Space Physics, 120, doi:10.1002/2014JA020863, 2015.

34. Motoba, T., S. Ohtani, E. Donovan, and V. Angelopoulos, On a possible connection between the longitudinally propagating near-Earth plasma sheet and auroral arc waves: A reexamination, J. Geophys. Res. Space Physics, 120, doi:10.1002/2014JA020694, 2015.

35. Sitnov, M., V. Merkin, M. Swisdak, T. Motoba, N. Buzulukova, T. Moore, B. Mauk, and S. Ohtani, Magnetic reconnection, buoyancy and flapping motions in magnetotail explosions, J. Geophys. Res. Space Physics, 119, 7151–7168, doi:10.1002/2014JA020205, 2014.

36. Motoba, T., Y. Ebihara, A. Kadokura, and A. T. Weatherwax, Fine-scale transient arcs seen in a shock aurora, J. Geophys. Res. Space Physics, 119, doi:10.1002/2014JA020229, 2014.

37. Ogawa, Y., T. Motoba, S. Buchert, I. Häggström, and S. Nozawa, Upper atmosphere cooling over the past 33 years, Geophys. Res. Lett., 41, doi:10.1002/2014GL060591, 2014.

38. Motoba, T., S. Ohtani, A. Kadokura, and J. Gjerloev, Interrelationship between preonset auroral and magnetic signatures at a geomagnetically conjugate Iceland-Syowa pair, J. Geophys. Res. Space Physics, 119, 761–769, doi:10.1002/2013JA019512, 2014.

39. Motoba, T., K. Takahashi, J. Gjerloev, S. Ohtani, and D. K. Milling, The role of compressional Pc5 pulsations in modulating precipitation of energetic electrons, J. Geophys. Res. Space Physics, 118, 7728–7739, doi:10.1002/2013JA018912, 2013.

40. Merkin, V. G., B. J. Anderson, J. G. Lyon, H. Korth, M. Wiltberger, and T. Motoba, Global evolution of Birkeland currents on 10 min timescales: MHD simulations and observations, J. Geophys. Res. Space Physics, 118, 4977–4997, doi:10.1002/jgra.50466, 2013.

41. Ogawa, Y., A. Kadokura, T. Motoba, Y. Tanaka, and K. Hosokawa, Processing and visualization of large amounts of auroral data obtained with All-sky/Narrow field-of-view parallel imagers in Tromso and Longyearbyen, Journal of Space Science informatics Japan, 2012, in press. (in Japanese)

42. Sato, N., A. Kadokura, T. Motoba, K. Hosokawa, G. Bjornsson, and T. Saemundsson, Ground-based aurora conjugacy and dynamic tracing of geomagnetic conjugate points,  in Auroral Phenomenology and Magnetospheric Processes: Earth and Other Planets, Geophys. Monogr. Ser., vol. 197, edited by A. Keiling et al. 91–98, AGU, Washington, D. C., doi:10.1029/2011GM001154, 2012.

43. Motoba, T., K. Hosokawa, Y. Ogawa, N. Sato, A. Kadokura, S. Milan, and M. Lester, Simultaneous ground-satellite observations of meso-scale auroral arc undulations, J. Geophys. Res., 117, A06213, doi:10.1029/2011JA017291, 2012.

44. Motoba, T., K. Hosokawa, A. Kadokura, and N. Sato, Magnetic conjugacy of northern and southern auroral beads, Geophys. Res. Lett., 39, L08108, doi:10.1029/2012GL051599, 2012.

45. Ogawa, Y., S. Nozawa, I. Haggstrom, S. Oyama, T. Motoba, T. Tsuda, A. Saito, Y. Miyashita, Y. Tanaka, G. Ueno, H. Miyaoka, and R. Fujii, Large-scale data processing and visualization of the European incoherent scatter (EISCAT) radar system, Journal of Space Science Informatics Japan, vol. 1, 83-89, 2012. (in Japanese)

46. Tanaka, Y., A. Shinbori, M. Kagitani, T. Hori, S. Abe, Y. Koyama, H. Hayashi, D. Yoshida, T. Kono, S.Ueno, N. Kaneda, M. Yoneda, H. Tadokoro, T. Motoba, Y. Miyoshi, K. Seki, Y. Miyashita, T. Segawa, and Y. Ogawa, Development of IUGONET data analysis software, Journal of Space Science Informatics Japan, vol. 1, 91-98, 2012. (in Japanese)

47. Hayashi, H., Y. Koyama, T. Hori, Y. Tanaka, A. Shinbori, M. Kagitani, , S. Abe, T. Kono, D. Yoshida, G. Ueno, N. Kaneda, M. Yoneda, H. Tadokoro, T. Motoba, Inter-university Upper atmosphere Global Observation NETwork (IUGONET) project, Journal of Space Science Informatics Japan, vol. 1, 113-120, 2012. (in Japanese)

48. Motoba, T., Long-term data analysis of ionosphere over Syowa Station, Antarctica, Special Issue on Space Weather Forecast, Journal of NICT, Vol. 56, Nos. 1-4, p.447-463, 2011.

49. Fujita, S., T. Tanaka, and T. Motoba, Long-period ULF waves driven by periodic solar wind disturbances, IAGA Special Sopron Book Series “The Dynamic Magnetosphere”, edited by Liu William and Fujimoto Masaki, Vol. 3, p.39-45, 2011.

50. Motoba, T., K. Hosokawa, Y. Ogawa, N. Sato, A. Kadokura, S. C. Buchert, and H. Rème, In-situ evidence for interplanetary magnetic field induced tail twisting associated with relative displacement of conjugate auroral features, J. Geophys. Res., 116, A04209, doi:10.1029/2010JA016206, 2011.

51. Motoba, T., K. Hosokawa, N. Sato, A. Kadokura, and G. Bjornsson, Varying interplanetary magnetic field By effects on interhemispheric conjugate auroral features during a weak substorm, J. Geophys. Res., 115, A09210, doi:10.1029/2010JA015369, 2010.

52. Hosokawa, K., T. Motoba, A. S., Yukimatsu, S. E. Milan, M. Lester, A. Kadokura, N. Sato, and G. Bjornsson, Plasma irregularities adjacent to auroral patches in the postmidnight sector, J. Geophys. Res., 115, A09303, doi:10.1029/2010JA015319, 2010.

53. Motoba, T., A. Kadokura, Y. Ebihara, H. U. Frey, A. T. Weatherwax, and N. Sato, Simultaneous ground-satellite optical observations of postnoon shock aurora in the Southern Hemisphere, J. Geophys. Res., 114, A07209, doi:10.1029/2008JA014007, 2009.

54. 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, 2009.

55. Motoba, T., S. Fujita, T. Kikuchi, and T. Tanaka, Solar wind dynamic pressure forced oscillation of the magnetosphere-ionosphere coupling system: A numerical simulation of directly pressure-forced geomagnetic pulsations, J. Geophys. Res., 112, A11204, doi:10.1029/2006JA012193, 2007.

56. Tsuda, T., S. Nozawa, A. Brekke, Y. Ogawa, T. Motoba, R. Roble, and R. Fujii, An ion drag contribution to the lower thermospheric wind in the summer polar region, J. Geophys. Res., 112, A06319, doi:10.1029/2006JA011785, 2007.

57. Fujita S., T. Tanaka, and T. Motoba, A numerical simulation of the geomagnetic sudden commencement: 3. A sudden commencement in the magnetosphere-ionosphere compound system, J. Geophys. Res., 110, A11203, doi:10.1029/2005JA011055, 2005.

58. Motoba, T., T. Kikuchi, T. F. Shibata, and K. Yumoto, HF Doppler oscillations in the low-latitude ionosphere coherent with equatorial long-period geomagnetic field oscillations, J. Geophys. Res., 109, A06214, doi:10.1029/2004JA010442, 2004.

59. Motoba, T., T. Kikuchi, T. Okuzawa, and K. Yumoto, Dynamical response to the magnetosphere-ionosphere system to a solar wind dynamic pressure oscillation, J. Geophys. Res., 108(A5), 1206, doi:10.1029/2002JA009696, 2003.

60. Motoba, T., T. Kikuchi, H. Lühr, T.-I. Kitamura, H. Tachihara, K. Hayashi, and T. Okuzawa, Global Pc5 caused by a DP2-type ionospheric current system, J. Geophys. Res., 107(A2), 1032, doi:10.1029/2001JA900156, 2002.

61. Motoba, T., T. Kikuchi, H. Lühr, H. Tachihara, T.-I. Kitamura, and T. Okuzawa, Equatorial Pc5 associated with moving current vortices in the high-latitude ionosphere, COSPAR Colloquia Series 12, Space weather study using multipoint techniques, edited by Ling-Hiao Lyu, p.255－258, 2002.

Ph.D thesis

Motoba, T., (2003), Characteristics of long-period geomagnetic pulsations occurring on a global scale, University of Electro-Communications, Japan.