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Dawn-Dusk Asymmetry of Plasma Flow in Jupiter's Middle Magnetosphere Observed by Juno
  • +6
  • Jianzhao Wang,
  • Fran Bagenal,
  • Robert Wilson,
  • Edward Nerney,
  • Robert Ebert,
  • Philip Valek,
  • Frederic Allegrini,
  • Jamey Szalay,
  • Peter Delamere
Jianzhao Wang
Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Department of Astrophysical and Planetary Sciences, University of Colorado Boulder

Corresponding Author:[email protected]

Author Profile
Fran Bagenal
Laboratory for Atmospheric and Space Physics, University of Colorado Boulder
Robert Wilson
Laboratory for Atmospheric and Space Physics, University of Colorado Boulder
Edward Nerney
Laboratory for Atmospheric and Space Physics, University of Colorado Boulder
Robert Ebert
Southwest Research Institute, University of Texas at San Antonio
Philip Valek
Southwest Research Institute
Frederic Allegrini
Southwest Research Institute, University of Texas at San Antonio
Jamey Szalay
Department of Astrophysical Sciences, Princeton University
Peter Delamere
Geophysical Institute, University of Alaska Fairbanks

Abstract

Based on plasma observations from Juno's JADE instrument and forward modeling, we investigate the dawn-dusk asymmetries within Jupiter’s magnetosphere between 10-40 RJ. On the dawnside, the flux tubes are depleted characterized by low density and near rigid-corotation velocity, with a low temperature and thin plasma sheet. On the duskside, the flux tubes are assimilated characterized by high density and sub-corotation velocity, with a hotter and thicker plasma sheet. Super-corotating hot inflows originating from reconnection events are identified in the pre-dawn sector. These observations are consistent with the Vasyliunas cycle, suggesting it operates in a region closer to Jupiter than previous studies suggested. Outflows are locally coupled with swept-back magnetic fields and are frequently observed near midnight. Inflows are locally coupled with swept-forward fields with higher temperatures. The discernible temperature difference between inflows and outflows reveals their distinct origins. Plasma beta increases with radial distance, suggesting increased instabilities at larger distances.
30 Sep 2024Submitted to ESS Open Archive
03 Oct 2024Published in ESS Open Archive