Presentation Information
[PEM16-P20]Horizontal structures of Helium ion in the upper ionosphere observed by ISS-IMAP/EUVI
*Yuta Hozumi1, Akinori Saito1, Ichiro Yoshikawa2, Atsushi Yamazaki3, Go Murakami3 (1.Graduate School of Science, Kyoto University, 2.The University of Tokyo, 3.Institute of Space and Astronautical Science / Japan Aerospace Exploration Agency)
Horizontal structures of ionized 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 He II radiation (30.4 nm) from the International Space Station (ISS) since October 2012. North-south asymmetry and longitudinal structure of ionized Helium were found. North-south asymmetry in solstice seasons are well consistent with 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.