Observational test of shock drift and Fermi acceleration on a seed particle population upstream of earth's bow shock

Details Observational test of shock drift and Fermi acceleration on a seed particle population upstream of earth's bow shock Observational test of shock drift and Fermi acceleration on a seed particle population upstream of earth's bow shock

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.5541a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 1, 1988, p. 5541-5546.

Physics

14

Bow Waves, Particle Acceleration, Plasma Interactions, Shock Waves, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Field Configurations

Scientific paper

The efficiency of proposed shock acceleration mechanisms as they operate at the bow shock in the presence of a seed energetic particle population was examined using data from simultaneous observations of energetic solar-origin protons, carried out by the IMP 7 and 8 spacecraft in the vicinity of the quasi-parallel (dawn) and quasi-perpendicular (dusk) regions of the earth's bow shock, respectively. The results of observations (which include acceleration effects in the intensities of the energetic protons with energies as high as 4 MeV observed at the vicinity of the dusk bow shock, but no evidence for any particle acceleration at the energy equal to or above 50 keV at the dawn side of the bow shock) indicate that the acceleration of a seed particle population occurs only at the quasi-perpendicular bow shock through shock drift acceleration and that the major source of observed upstream ion populations is the leakage of magnetospheric ions of energies not less than 50 keV, rather than in situ acceleration.

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