Japan Geoscience Union Meeting 2016

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International Session (Oral)

Symbol P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS01] Outer Solar System Exploration Today, and Tomorrow

Sun. May 22, 2016 1:45 PM - 3:05 PM A02 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Jun Kimura(Earth-Life Science Institute, Tokyo Institute of Technology), Masaki Fujimoto(Institite of Space and Astronautical Science, Japan Aerospace Exploration Agency), Yasumasa Kasaba(Dep. Geophysics Graduate School of Science Tohoku University), Sho Sasaki(Department of Earth and Space Sciences, School of Science, Osaka University), Takayuki Tanigawa(School of Medicine, University of Occupational and Environmental Health), Yasuhito Sekine(Department of Earth and Planetary Science, University of Tokyo), Kunio Sayanagi(Atmospheric and Planetary Sciences Department, Hampton University), Steven Vance(Jet Propulsion Laboratory, Caltech), Chair:Hiroaki Misawa(Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University), Kazuo Yoshioka(Department of Earth & Planetary Science, Graduate School of Science, The University of Tokyo)

2:50 PM - 3:05 PM

[PPS01-16] Radial distribution of sulfur and oxygen ions in the Io plasma torus observed by Hisaki spacecraft

*Kazuo Yoshioka1, Fuminori Tsuchiya2, Tomoki Kimura3, Go Murakami4, Ichiro Yoshikawa1, Atsushi Yamazaki4, Yasumasa Kasaba2, Masaki Fujimoto4 (1.The University of Tokyo, 2.Tohoku University, 3.RIKEN, 4.ISAS/JAXA)

Keywords:Io plasma torus, sulfur, oxygen

The imaging spectrum of Io plasma torus in extreme ultraviolet (50-150nm) has been observed by EXCEED on Hisaki. We analyzed them using the spectrum diagnosis method and deduced the column averaged plasma parameters (such as S+, S++, S+++, O+, etc.) from the radial distance of 6 to 8 Jovian radii. The local densities of those ions are deduced and the clear increase of S+ (about 3 times) after the Io’s outburst event in 2015 are seen.