Kimura, T;
Kraft, RP;
Elsner, RF;
Branduardi-Raymont, G;
Gladstone, GR;
Tao, C;
Yoshioka, K;
... Murray, SS; + view all
(2016)
Jupiter's X-ray and EUV auroras monitored by Chandra, XMM-Newton, and Hisaki satellite.
Journal of Geophysical Research: Space Physics
, 121
(3)
pp. 2308-2320.
10.1002/2015JA021893.
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Abstract
Jupiter's X-ray auroral emission in the polar cap region results from particles which have undergone strong field-aligned acceleration into the ionosphere. The origin of precipitating ions and electrons and the time variability in the X-ray emission are essential to uncover the driving mechanism for the high-energy acceleration. The magnetospheric location of the source field line where the X-ray is generated is likely affected by the solar wind variability. However, these essential characteristics are still unknown because the long-term monitoring of the X-rays and contemporaneous solar wind variability has not been carried out. In April 2014, the first long-term multiwavelength monitoring of Jupiter's X-ray and EUV auroral emissions was made by the Chandra X-ray Observatory, XMM-Newton, and Hisaki satellite. We find that the X-ray count rates are positively correlated with the solar wind velocity and insignificantly with the dynamic pressure. Based on the magnetic field mapping model, a half of the X-ray auroral region was found to be open to the interplanetary space. The other half of the X-ray auroral source region is magnetically connected with the prenoon to postdusk sector in the outermost region of the magnetosphere, where the Kelvin-Helmholtz (KH) instability, magnetopause reconnection, and quasiperiodic particle injection potentially take place. We speculate that the high-energy auroral acceleration is associated with the KH instability and/or magnetopause reconnection. This association is expected to also occur in many other space plasma environments such as Saturn and other magnetized rotators.
Type: | Article |
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Title: | Jupiter's X-ray and EUV auroras monitored by Chandra, XMM-Newton, and Hisaki satellite |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1002/2015JA021893 |
Publisher version: | http://doi.org/10.1002/2015JA021893 |
Language: | English |
Additional information: | This version is the version of record [delete as appropriate]. For information on re-use, please refer to the publisher’s terms and conditions. |
Keywords: | Jupiter; X-ray; magnetosphere |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
URI: | https://discovery.ucl.ac.uk/id/eprint/1496068 |
1. | United States | 4 |
2. | China | 2 |
3. | Russian Federation | 2 |
4. | Germany | 1 |
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