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 11:00 AM - 11:45 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)

11:30 AM - 11:45 AM

[PEM11-16] Horizontal structures of Helium ion in the upper ionosphere observed by ISS-IMAP/EUVI

*Yuta HOZUMI1, Akinori SAITO1, Atsushi YAMAZAKI2, Go MURAKAMI2, Ichiro YOSHIKAWA3 (1.Department of Geophysics, Graduate School of Science, Kyoto University, 2.Institute of Space and Astronautical Science / Japan Aerospace Exploration Agency, 3.The University of Tokyo)

Keywords:topside ionosphere, Helium ion

Horizontal structures of ionised Helium in the upper ionosphere of dusk side were obtained from observation of resonant scattering light. The Extreme Ultra Violet Imager (EUVI) of the ISS-IMAP (Ionosphere, Mesosphere, upper Atmosphere and Plasmasphere mapping) mission has taken image of HeII radiation (30.4 nm) from the International Space Station (ISS) since October 2012. North-south asymmetry and longitudinal structure of ionised Helium were found. North-south asymmetry in solstice seasons is well consistent with the previous in-situ measurement and numerical simulation. However, the longitudinal structure is not reported before and cannot be explained by numerical simulation with SAMI2-model. The longitudinal difference of meridional wind is a candidate of the Helium ion structure.