MeV magnetosheath ions energized at the bow shock

Academic Article


  • A causal relationship between midlatitude magnetosheath energetic ions and bow shock magnetic geometry was previously established for ion energy up to 200 keV e−1 for the May 4, 1998, storm event. This study demonstrates that magnetosheath ions with energies above 200 keV up to 1 MeV simply extend the ion spectrum to form a power law tail. Results of cross-correlation analysis suggest that these ions also come directly from the quasi-parallel bow shock, not the magnetosphere. This is confirmed by a comparison of energetic ion fluxes simultaneously measured in the magnetosheath and at the quasi-parallel bow shock when both regions are likely connected by the magnetic field lines. We suggest that ions are accelerated at the quasi-parallel bow shock to energies as high as 1 MeV and subsequently transported into the magnetosheath during this event.
  • Authors

  • Chang, SW
  • Scudder, JD
  • Kudela, K
  • Spence, Harlan
  • Fennell, JF
  • Lepping, RP
  • Lin, RP
  • Status

    Publication Date

  • September 1, 2001
  • Published In

    Digital Object Identifier (doi)

    Start Page

  • 19101
  • End Page

  • 19115
  • Volume

  • 106
  • Issue

  • A9