Seasonal and spatial variation of topside He+ column density obtained from Extreme Ultra Violet Imager onboard the International Space Station

Yuta Hozumi, Utah State University, Physics, Logan, United States, Akinori Saito, Kyoto University, Kyoto, Japan, Go Murakami, Japan Aerospace Exploration Agency, Kanagawa, Japan, Atsushi Yamazaki, ISAS/JAXA, Sagamihara, Kanagawa, Japan and Ichiro Yoshikawa, The University of Tokyo, Tokyo, Japan