Abstract

Shock waves in collisionless plasmas are among the most efficient particle accelerators in space. Shock reformation is a process important to plasma heating and acceleration, but direct observations of reformation at quasi-parallel shocks have been lacking. Here, we investigate Earth's quasi-parallel bow shock with observations by the four Magnetospheric Multiscale spacecraft. The multi-spacecraft observations provide evidence of short large-amplitude magnetic structures (SLAMS) causing reformation of the quasi-parallel shock. We perform an ion-kinetic Vlasiator simulation of the bow shock and show that SLAMS reforming the bow shock recreates the multi-spacecraft measurements. This provides a method for identifying shock reformation in the future.
Original languageEnglish
Article numbere2021GL096335
JournalGeophysical Research Letters
Volume49
Issue number2
Number of pages7
ISSN0094-8276
DOIs
Publication statusPublished - 28 Jan 2022
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 115 Astronomy, Space science
  • collisionless shock
  • quasi-parallel
  • shock reformation
  • satellite measurements
  • plasma simulation
  • AMPLITUDE MAGNETIC-STRUCTURES
  • CYCLIC BEHAVIOR
  • BOW SHOCK
  • FIELD
  • ACCELERATION
  • FORESHOCK

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