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

T. Kimura, R. P. Kraft, R. F. Elsner, G. Branduardi-Raymont, G. R. Gladstone, C. Tao, K. Yoshioka, G. Murakami, A. Yamazaki, F. Tsuchiya, M. F. Vogt, A. Masters, H. Hasegawa, S. V. Badman, E. Roediger, Y. Ezoe, W. R. Dunn, I. Yoshikawa, M. Fujimoto, S. S. Murray

Research output: Contribution to journalArticle

21 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2308-2320
Number of pages13
JournalJournal of Geophysical Research A: Space Physics
Volume121
Issue number3
DOIs
Publication statusPublished - 2016 Mar 1

Keywords

  • Jupiter
  • X-ray
  • magnetosphere

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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