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    Rights statement: An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union.

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  • Tao_et_al-2018-Geophysical_Research_Letters

    Rights statement: ©2017. American Geophysical Union.All Rights Reserved. Tao, C., Kimura, T., Tsuchiya, F., Muirakami, G., Yoshioka, K., Yamazaki, A., … Fujimoto, M. (2018). Variation of Jupiter's aurora observed by Hisaki/EXCEED: 3. Volcanic control of Jupiter's aurora. Geophysical Research Letters, 45, 71–79. https://doi.org/10.1002/2017GL075814 To view the published open abstract, go to http://dx.doi.org/10.1002/2017GL075814

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Variation of Jupiter's Aurora Observed by Hisaki/EXCEED: 3. Volcanic Control of Jupiter's Aurora: Io's Volcanic Effect on Jovian Aurora

Research output: Contribution to journalJournal article

Published
  • Chihiro Tao
  • Tomoki Kimura
  • Fuminori Tsuchiya
  • Go Muirakami
  • Kazuo Yoshioka
  • Atsushi Yamazaki
  • Sarah V. Badman
  • Hiroaki Misawa
  • Hajime Kita
  • Yasumasa Kasaba
  • Ichiro Yoshikawa
  • Masaki Fujimoto
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<mark>Journal publication date</mark>16/01/2018
<mark>Journal</mark>Geophysical Research Letters
Issue number1
Volume45
Number of pages9
Pages (from-to)71-79
Publication statusPublished
Early online date10/01/18
Original languageEnglish

Abstract

Temporal variation of Jupiter's northern aurora during enhanced Io volcanic activity was detected using the EXCEED spectrometer on board the Hisaki Earth-orbiting planetary space telescope. It was found that in association with reported Io volcanic events in early 2015, auroral power and estimated field-aligned currents were enhanced during day of year 40–120. Furthermore, the far ultraviolet color ratio decreased during the event, indicating a decrease of auroral electron mean energy and total acceleration by <30%. During the episode of enhanced Io volcanic activity, Jupiter's magnetosphere contains more source current via increased suprathermal plasma density by up to 42%; therefore, it would have required correspondingly less electron acceleration to maintain the enhanced field-aligned current and corotation enforcement current. Sporadic large enhancements in auroral emission detected more frequently during the active period could have been contributed by nonadiabatic magnetospheric energization.

Bibliographic note

An edited version of this paper was published by AGU. Copyright 2017 American Geophysical Union.