High energy ions and electrons upstream from the Earth's bow shock and their dependence on geomagnetic conditions: Statistical results between years 1982-1988

Details High energy ions and electrons upstream from the Earth's bow shock and their dependence on geomagnetic conditions: Statistical results between years 1982-1988 High energy ions and electrons upstream from the Earth's bow shock and their dependence on geomagnetic conditions: Statistical results between years 1982-1988

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2151a&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 14, p. 2151-2154

Physics

9

Interplanetary Physics: Energetic Particles, Planetary, Interplanetary Physics: Planetary Bow Shocks

Scientific paper

We present initial results from a statistical analysis of 2034 energetic (50-220 keV) ion events observed by the IMP-8 spacecraft upstream from the Earth's bow shock during a 6 years period. The most important findings are the following: (1) the percentage Pe of high intensity energetic ion events accompanied by the presence of relativistic (>=220 keV) electrons is ~80% (for all geomagnetic conditions), and increases significantly with increasing the index Kp of geomagnetic activity, (2) high intensity energetic ion events most often (~93%) show spectra extending up to energies E>~300keV, (3) a percentage of ~71.5% of events display non-inverse energy dispersion of ion intensities. The above results, as well as additional results discussed in the text, suggest that a percentage as high as ~80% of high intensity 50-220 keV ion events in our statistical sample have an origin within the magnetosphere.

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