TY - JOUR
T1 - Variation of Jupiter's Aurora Observed by Hisaki/EXCEED
T2 - 4. Quasi-Periodic Variation
AU - Tao, Chihiro
AU - Kimura, Tomoki
AU - Kronberg, Elena A.
AU - Tsuchiya, Fuminori
AU - Murakami, Go
AU - Yamazaki, Atsushi
AU - Vogt, Marissa F.
AU - Bonfond, Bertrand
AU - Yoshioka, Kazuo
AU - Yoshikawa, Ichiro
AU - Kasaba, Yasumasa
AU - Kita, Hajime
AU - Okamoto, Shogo
N1 - Funding Information:
We acknowledge the working teams of Hisaki/EXCEED and Juno. We acknowledge Dr. Andreas Lagg for the use of his software to analyze the Galileo EPD data. This work was supported by MEXT/JSPS KAKENHI Grants 19H01948 and 20KK0074. EK is supported by German Research Foundation (DFG) under number KR 4375/2-1 within SPP ?Dynamic Earth.? MFV was supported by NASA Grant 80NSSC17K0777 as part of the Solar System Workings program and by the National Science Foundation under Award 1524651. We acknowledge the contribution of the International Space Sciences Institute (ISSI) in Bern, Switzerland, for hosting and funding the ISSI international teams on ?The influence of Io on Jupiter's magnetosphere? (ID388), ?How does the solar wind influence the giant planet magnetospheres?? (ID357), and "Mass loss from Io's unique atmosphere: Do volcanoes really control Jupiter's magnetosphere?" (ID515) and the constructive discussions had by these team members. We also thank NASA-Hisaki PSP members for useful discussions. CT thanks to the referees for their productive and valuable comments.
Funding Information:
We acknowledge the working teams of Hisaki/EXCEED and Juno. We acknowledge Dr. Andreas Lagg for the use of his software to analyze the Galileo EPD data. This work was supported by MEXT/JSPS KAKENHI Grants 19H01948 and 20KK0074. EK is supported by German Research Foundation (DFG) under number KR 4375/2‐1 within SPP “Dynamic Earth.” MFV was supported by NASA Grant 80NSSC17K0777 as part of the Solar System Workings program and by the National Science Foundation under Award 1524651. We acknowledge the contribution of the International Space Sciences Institute (ISSI) in Bern, Switzerland, for hosting and funding the ISSI international teams on “The influence of Io on Jupiter's magnetosphere” (ID388), “How does the solar wind influence the giant planet magnetospheres?” (ID357), and "Mass loss from Io's unique atmosphere: Do volcanoes really control Jupiter's magnetosphere?" (ID515) and the constructive discussions had by these team members. We also thank NASA‐Hisaki PSP members for useful discussions. CT thanks to the referees for their productive and valuable comments.
Publisher Copyright:
© 2020. American Geophysical Union. All Rights Reserved.
PY - 2021/2
Y1 - 2021/2
N2 - Quasi-periodic variations of a few to several days are observed in the energetic plasma and magnetic dipolarization in Jupiter's magnetosphere. Variation in the plasma mass flux related to Io's volcanic activity is proposed as a candidate for the variety of the period. Using a long-term monitoring of Jupiter's northern aurora by the Earth-orbiting planetary space telescope Hisaki, we analyzed the quasi-periodic variation seen in the auroral power integrated over the northern pole for 2014–2016, which included monitoring Io's volcanically active period in 2015 and the solar wind near Jupiter during Juno's approach phase in 2016. Quasi-periodic variation with periods of 0.8–8 days was detected. The difference between the periodicities during volcanically active and quiet periods is not significant. Our data set suggests that the difference of period between volcanically active and quiet conditions is below 1.25 days. This is consistent with the expected difference estimated from a proposed relationship based on a theoretical model applied to the plasma variation of this volcanic event. The periodicity does not show a clear correlation with the auroral power, central meridional longitude, nor Io phase angle. The periodic variation is continuously observed in addition to the auroral modulation due to solar wind variation. Furthermore, Hisaki auroral data sometimes shows particularly intense auroral bursts of emissions lasting <10 h. We find that these bursts coincide with peaks of the periodic variations. Moreover, the occurrence of these bursts increases during the volcanically active period. This auroral observation links parts of previous observations to give a global view of Jupiter's magnetospheric dynamics.
AB - Quasi-periodic variations of a few to several days are observed in the energetic plasma and magnetic dipolarization in Jupiter's magnetosphere. Variation in the plasma mass flux related to Io's volcanic activity is proposed as a candidate for the variety of the period. Using a long-term monitoring of Jupiter's northern aurora by the Earth-orbiting planetary space telescope Hisaki, we analyzed the quasi-periodic variation seen in the auroral power integrated over the northern pole for 2014–2016, which included monitoring Io's volcanically active period in 2015 and the solar wind near Jupiter during Juno's approach phase in 2016. Quasi-periodic variation with periods of 0.8–8 days was detected. The difference between the periodicities during volcanically active and quiet periods is not significant. Our data set suggests that the difference of period between volcanically active and quiet conditions is below 1.25 days. This is consistent with the expected difference estimated from a proposed relationship based on a theoretical model applied to the plasma variation of this volcanic event. The periodicity does not show a clear correlation with the auroral power, central meridional longitude, nor Io phase angle. The periodic variation is continuously observed in addition to the auroral modulation due to solar wind variation. Furthermore, Hisaki auroral data sometimes shows particularly intense auroral bursts of emissions lasting <10 h. We find that these bursts coincide with peaks of the periodic variations. Moreover, the occurrence of these bursts increases during the volcanically active period. This auroral observation links parts of previous observations to give a global view of Jupiter's magnetospheric dynamics.
KW - Hisaki
KW - Jupiter
KW - aurora
KW - magnetosphere
KW - quasi-periodic variation
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U2 - 10.1029/2020JA028575
DO - 10.1029/2020JA028575
M3 - Article
AN - SCOPUS:85102134290
VL - 126
JO - Journal of Geophysical Research: Space Physics
JF - Journal of Geophysical Research: Space Physics
SN - 2169-9380
IS - 2
M1 - e2020JA028575
ER -