Two-dimensional hybrid simulations of quasi-perpendicular collisionless shock dynamics: Gyrating downstream ion distributions

L. Ofman, M. Gedalin

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Quasi-perpendicular collisionless shocks undergo structural changes with the increase of the Mach number. These changes are related to the increasing role of the reflected ions, which have a highly nongyrotropic distribution. Eventually, it is expected that the shock front becomes nonstationary. At low and moderate Mach numbers, the fraction of reflected ions is small, yet recent observations show the existence of a well-pronounced structure of the postshock magnetic field in the close vicinity of the transition layer. Large amplitude oscillations were earlier interpreted as waves generated by the shock front or passing through the shock in the downstream direction. Here we show, using two-dimensional hybrid simulations of quasi-perpendicular shocks, that the gyration of the directly transmitted ions downstream of the ramp produces the spatial pressure variations, which are accompanied with the observed magnetic oscillations due to the momentum conservation. In a wide range of the upstream ion temperatures, the low and moderate-Mach-number shocks remain stationary and one-dimensional, so that the magnetic and electric field depend only on the coordinate along the shock normal. The downstream ion distributions gradually gyrotropize due to the collisionless mixing of gyrophases. Nonstationary effects in these shocks do not affect noticeably the ion dynamics. However, we find that with the increase of the Mach number, shocks form rippled fronts in the low-β and moderate-β regimes. Key Points Gyration of transmitted ions downstream the shock produces pressure variationsDownstream ion distributions gyrotropize due to collisionless gyrophase mixingIncreased Mach number shock with low- and moderate-beta form rippled fronts

Original languageEnglish
Pages (from-to)1828-1836
Number of pages9
JournalJournal of Geophysical Research: Space Physics
Volume118
Issue number5
DOIs
StatePublished - 1 Jan 2013

Keywords

  • 2.5D hybrid models
  • Collisionless shocks
  • Ion velocity distributions

ASJC Scopus subject areas

  • Space and Planetary Science
  • Geophysics

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