Chang, S.-W.,
Co-Authors: J. D. Scudder, K. Kudela, H. E. Spence, J. F. Fennell, R. P. Lepping, R. P. Lin, and C. T. Russell,
Title: MeV Magnetosheath ions energized at the bow shock,
Reference: J. Geophys. Res.,106,19101-19115, 2000.
Reference Type: Published Journal
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CAMMICE: true
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Abstract:
A causal relationship between mid-latitude magnetosheath energetic ions and bow shock magnetic geometry was previously established for ion energies up to 200 keV/e 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.