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Jupiter's X-ray and EUV auroras monitored by Chandra, XMM-Newton, and Hisaki satellite

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.
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Submitted on : Monday, May 23, 2022 - 11:36:10 AM
Last modification on : Monday, July 4, 2022 - 8:52:48 AM

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T. Kimura, R. P. Kraft, R. F. Elsner, G. Branduardi-Raymont, G. R. Gladstone, et al.. Jupiter's X-ray and EUV auroras monitored by Chandra, XMM-Newton, and Hisaki satellite. Journal of Geophysical Research: Space Physics, 2016, 121, pp.2308-2320. ⟨10.1002/2015JA021893⟩. ⟨insu-03675426⟩

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