Observations of oxygen in the inner magnetosphere of Saturn by Hisaki

Hiroyasu Tadokoro1, Fuminori Tsuchiya2, Tomoki Kimura3, Chihiro Tao4, Atsushi Yamazaki5, Go Murakami5, Kazuo Yoshioka6 and Ichiro Yoshikawa7, (1)Tokyo University of Technology, Hachioji, Japan, (2)Tohoku University, Sendai, Japan, (3)Japan Aerospace Exploration Agency, Kanagawa, Japan, (4)IRAP, Toulouse, France, (5)ISAS/JAXA, Sagamihara, Kanagawa, Japan, (6)JAXA Japan Aerospace Exploration Agency, Sagamihara, Japan, (7)University of Tokyo, Bunkyo-ku, Japan
Abstract:
Water group neutrals in Saturn’s inner magnetosphere play the dominant role in loss of energetic electrons and ions because of abundance of the neutral particles [e.g., Paranicas et al., 2007; Sittler et al., 2008]. Understanding of the temporal and spatial distributions of the neutrals is required to understand the plasma-neutral dynamics in Saturn. The atomic oxygen in the magnetosphere of Saturn was discovered by UVIS/Cassini [Esposito et al., 2005]. Melin et al., [2009] reported the spatial distribution of oxygen and the variation of the total number of oxygen with time scale of several days – several tens of days. The daily variation of oxygen is first detected by the EXCEED onboard Japanease Earth orbiting satellite “Hisaki”. We show the daily variation and spatial distribution of oxygen observed by Hisaki.
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