Effect of plasma density around Io on local electron heating in the Io plasma torus

Fuminori Tsuchiya1, Kazuo Yoshioka2, Masato Kagitani1, Tomoki Kimura3, Go Murakami4, Atsushi Yamazaki5, Hiroaki Misawa1, Yasumasa Kasaba6, Ichiro Yoshikawa7, Takeshi Sakanoi8, Ryoichi Koga8, Arakawa Ryo1, Fumiharu Suzuki7 and Reina Hikida7, (1)Tohoku University, Sendai, Japan, (2)University of Tokyo, Graduate School of Frontier Science, Bunkyo-ku, Japan, (3)Japan Aerospace Exploration Agency, Kanagawa, Japan, (4)ISAS-JAXA, Sagamihara, Japan, (5)ISAS/JAXA, Sagamihara, Kanagawa, Japan, (6)Tohoku University, Department of Geophysics, Graduate School of Science, Sendai, Japan, (7)The University of Tokyo, Tokyo, Japan, (8)PPARC, Tohoku University, Sendai, Japan