Field of Research

Space Physics
Selected Publications
    1.   Ozima, M., K. Seki, N. Terada, Y. N. Miura, F. A. Podosek, and H. Shinagawa, “Terrestrial nitrogen and noble gases in lunar soils”, Nature, 436(7051), 655-659, 2005.

    2.   Seki, K., Y. Miyoshi, D. Summers. and N. P. Meredith, “Comparative study of outer-zone relativistic electrons observed by AKEBONO and CRRES”, J. Geophys. Res., 110, doi: 10.1029/2004JA010655, 2005.

    3.    Seki, K., M. Hirahara, M. Hoshino, T. Terasawa, R. C. Elphic, Y. Saito, T. Mukai, H. hayakawa, H. Kojima, and H. Matsumoto, "Cold ions in the hot plasma sheet of Earth’s magnetotail", Nature, 442(6932), 589-592, 2003.

    4.    Seki, K., R. C. Elphic, M. F. Thomsen, J. Bonnell, J. P. McFadden, E. J. Lund, M. Hirahara, T. Terasawa, and T. Mukai, "A new perspective on plasma supply mechanisms to the magnetotail from a statistical comparison of dayside mirroring O+ at low altitudes with lobe/mantle beams", J. Geophys. Res., 107(A4), doi:10.1029/2001JA900122, 2002.

    5.    Seki, K., R. C. Elphic, M. Hirahara, T. Terasawa, and T. Mukai, "On Atmospheric Loss of Oxygen Ions from Earth Through Magnetospheric Processes", Science, 291(5510), 1939-1941, 2001.

    6.    Seki, K., R. C. Elphic, M. F. Thomsen, J. Bonnell, E. J. Lund, M. Hirahara, T. Terasawa, T. Mukai, "Cold flowing O+ beams in the lobe/mantle at GEOTAIL: Does FAST observe the source?", J. Geophys. Res., 105(A7), 15931-15944, 2000.

    7.    Seki, K., M. Hirahara, T. Terasawa, T. Mukai, and S. Kokubun, "Properties of He+ beams observed by Geotail in the lobe/mantle regions: Comparison with O+ beams", J. Geophys. Res., 104(A4), 6973-6986, 1999.

    8.    Seki, K., T. Terasawa, M. Hirahara, and T. Mukai, "Quantification of tailward cold O+ beams in the lobe/mantle regions with Geotail data: Constraints on polar O+ outflows", J. Geophys. Res., 103(A12), 29371-29381, 1998.

    9.    Seki, K., M. Hirahara, T. Terasawa, T. Mukai, Y. Saito, S. Machida, T. Yamamoto, and S. Kokubun, "Statistical properties and possible supply mechanisms of tailward cold O+ beams in the lobe/mantle regions", J. Geophys. Res., 103(A3), 4477-4490, 1998.

    10.    Seki, K., M. Hirahara, T. Terasawa, I. Shinohara, T. Mukai, Y. Saito, S. Machida, T. Yamamoto, S. Kokubun, "Coexistence of Earth-origin O+ and solar wind-origin H+/He++ in the distant magnetotail", Geophys. Res. Lett., 23(9), 985-988, 1996