[P-PS08] 惑星科学

[PPS08-P18] Long-term variation in composition and temperature of plasmas in the Io plasma torus obtained by the EUV spectroscopic observations with Hisaki/EXCEED

*疋田 伶奈¹、吉岡 和夫²、村上 豪³、木村 智樹⁴、土屋 史紀⁵、吉川 一朗² (1.東京大学大学院 理学系研究科 、2.東京大学大学院 新領域創成科学研究科 、3.宇宙航空研究開発機構　宇宙科学研究所、4.国立研究開発法人理化学研究所　仁科加速器研究センター、5.東北大学理学研究科　惑星プラズマ・大気研究センター)

In the Jovian inner magnetosphere, plasmas originating from Io's volcanoes are picked up by the Jovian magnetic field and co-rotate to form the Io plasma torus (IPT). Previous observations have shown that the composition and temperature of the plasmas vary in accordance with the volcanic activity, although they have not captured the whole temporal aspect of the effect of the volcanic activity. In this research, we will show the long-term variation in composition and temperature of plasma in the IPT, obtained by using spectral diagnosis for dataset obtained by EXCEED on the Hisaki satellite. We will also show the characteristics of plasmas during brightenings of the IPT and aurora, which indicate the energy transportation between the inner magnetosphere and the distant region (magnetically connected to the polar region).