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

[PPS01-14] Jupiter's auroral observations by Hisaki/EXCEED and expectation toward collaborations with Juno

*垰 千尋¹、木村 智樹²、村上 豪³、吉岡 和夫⁴、土屋 史紀⁵、北 元⁵、André Nicolas⁶、Badman Sarah⁷、Michel Blanc⁶、吉川 一朗⁴、山崎 敦³、塩田 大幸⁸、田所 裕康⁹、笠羽 康正⁵、藤本 正樹³ (1.情報通信研究機構、2.理化学研究所、3.ISAS/JAXA、4.東京大学、5.東北大学、6.IRAP、7.Lancaster University、8.名古屋大学、9.武蔵野大学)

キーワード：Jupiter, Aurora, EXCEED/Hisaki

Ultraviolet (UV) emissions from atmospheric H₂ and H reflect powerful polar energetics at outer planets. UV spectra provides information related with the precipitating auroral electron energy. Auroral electron energy and flux relationship shows variety among Jupiter’s auroral regions. The spectrometer EXCEED onboard JAXA’s Earth-orbiting planetary telescope Hisaki monitors extreme UV emissions from Jovian aurora and Io plasma torus continuously. Hisaki succeeded to detect sporadic, large auroral power enhancements lasting both short- (<1 planetary rotation) and long-term (>a few rotations) variations and their modulations by an Io’s volcanic activity over several weeks. The spectral information taken by Hisaki enables us to investigate (1) the time variation of the auroral electron during these emission enhancements, (2) statistical survey for occurrence of polar-dominant events, and (3) associated magnetospheric dynamics for these emission enhancement events using the Knight’s aurora acceleration theory. Expecting collaborative observation with Juno will be discussed.