Rights statement: An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union.
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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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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Variation of Jupiter's Aurora Observed by Hisaki/EXCEED: 3. Volcanic Control of Jupiter's Aurora
T2 - Io's Volcanic Effect on Jovian Aurora
AU - Tao, Chihiro
AU - Kimura, Tomoki
AU - Tsuchiya, Fuminori
AU - Muirakami, Go
AU - Yoshioka, Kazuo
AU - Yamazaki, Atsushi
AU - Badman, Sarah V.
AU - Misawa, Hiroaki
AU - Kita, Hajime
AU - Kasaba, Yasumasa
AU - Yoshikawa, Ichiro
AU - Fujimoto, Masaki
N1 - An edited version of this paper was published by AGU. Copyright 2017 American Geophysical Union.
PY - 2018/1/16
Y1 - 2018/1/16
N2 - 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.
AB - 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.
KW - Jupiter
KW - aurora
KW - Io
KW - interaction
KW - Hisaki
U2 - 10.1002/2017GL075814
DO - 10.1002/2017GL075814
M3 - Journal article
VL - 45
SP - 71
EP - 79
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 1
ER -