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

Tao, Chihiro and Kimura, Tomoki and Tsuchiya, Fuminori and Muirakami, Go and Yoshioka, Kazuo and Yamazaki, Atsushi and Badman, Sarah V. and Misawa, Hiroaki and Kita, Hajime and Kasaba, Yasumasa and Yoshikawa, Ichiro and Fujimoto, Masaki (2018) Variation of Jupiter's Aurora Observed by Hisaki/EXCEED: 3. Volcanic Control of Jupiter's Aurora:Io's Volcanic Effect on Jovian Aurora. Geophysical Research Letters, 45 (1). pp. 71-79. ISSN 0094-8276

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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.

Item Type:
Journal Article
Journal or Publication Title:
Geophysical Research Letters
Additional Information:
An edited version of this paper was published by AGU. Copyright 2017 American Geophysical Union.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900
Subjects:
ID Code:
89779
Deposited By:
Deposited On:
16 Feb 2018 10:28
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Sep 2020 04:18