Japan Geoscience Union Meeting 2015

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International Session (Oral)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM11] New frontier: Observations of the middle and upper atmospheres from ISS

Mon. May 25, 2015 9:00 AM - 10:45 AM A01 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Akinori Saito(Department of Geophysics, Graduate School of Science, Kyoto University), Mitsuteru Sato(Department of Cosmoscience, Hokkaido University), Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University), Tomoo Ushio(Information and communication engineering department, Osaka University), Makoto Suzuki(Institute for Space and Astronautical Sciences, Japan Aerospace Exploration Agency), Chair:Akinori Saito(Department of Geophysics, Graduate School of Science, Kyoto University), Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University)

10:15 AM - 10:30 AM

[PEM11-12] Estimating ionospheric property by using simultaneous observations of lightning and whistlers from ISS GLIMS mission

*Katsunori SUZUKI1, Kanata KAKINUMA1, Yasuhide HOBARA1, Ivan Linscott2, Umran Inan2, Mitsuteru SATO3, Yukihiro TAKAHASHI3, Tomoo USHIO4, Zenichiro KAWASAKI4, Takeshi MORIMOTO5, Atsushi YAMAZAKI6, Makoto SUZUKI6 (1.Graduate School of Informatics and Engineering, The University of Electro-Communications, 2.Department of Electrical Engineering, Stanford University, 3.Department of Cosmosciences, Graduate School of Science, Hokkaido University, 4.Information and communication engineering department, Osaka University, 5.Faculty of Science and Engineering, Kinki University, 6.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)

Keywords:Whistler, ionosphere F layer, GLIMS, International Space Station

The atmospherics in the VLF frequency range from lightening penetrating through the ionosphere are observed as lightning whistlers. In particular, whistlers observed in the space just after penetrating through the ionosphere are so-called fractional hop whistlers. Since whistlers penetrate through the ionosphere plasma, which is dispersive medium, the group delays of whistler waves with different frequency contain the information of the electron density of ionosphere. In this paper, we estimate the maximum electron density of the ionosphere F2 layer by using the delay time introduced by the optical observation and electromagnetic observation of Global Lightning and SprIte Measurements (GLIMS) mission onboard ISS. And we use another analysis method, the dispersion of whistles. As a result, we found that estimated electron densities from two analysis methods are in good agreement with those from IRI model for whistlers with a small dispersion. We consider that maximum electron density estimation of the ionosphere F2 layer over the ocean or remote area by using whistler dispersion information is useful.