Magnetospheric origin of energetic (at least 50 keV) ions upstream of the bow shock - The October 31, 1977, event

Details Magnetospheric origin of energetic (at least 50 keV) ions upstream of the bow shock - The October 31, 1977, event Magnetospheric origin of energetic (at least 50 keV) ions upstream of the bow shock - The October 31, 1977, event

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3020a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3020-3028.

Mathematics

Logic

41

Bow Waves, Earth Magnetosphere, Anisotropy, Energy Spectra, Explorer 47 Satellite, Explorer 50 Satellite, Geomagnetic Tail, International Sun Earth Explorer 1, Interplanetary Magnetic Fields

Scientific paper

Energetic particle data gathered by the ISEE-1 and IMP-7 and -8 spacecraft on Oct. 31, 1977 while travelling inside the plasma sheet upstream of the earth's bow shock are analyzed for an indication of the source of the 30 keV-1 MeV particles observed. The IMP spacecraft also travelled through the magnetosphere and the dawn bow shock during the measurement data. The data included records of magnetospheric bursts of energetic protons, which had intensities about 2-8 times higher inside the plasma sheet than did the proton intensities. The magnetospheric bursts began about 40 min before the ISEE recorded an upstream ion event and 2 hr before its cutoff. Other data indicated that the appearance of upstream ions was controlled by the interplanetary magnetic field. The ions arose in the plasma sheet of the magnetosphere and in 'leaking' upstream experienced a separation of ions from electrons, a condition caused by the interplanetary magnetic field. A phenomenological model is developed for the process of injection of energetic particles upstream of the bow shock in a manner that is not commensurate with Fermi acceleration.

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