Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15....9f&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 15, no. 8-9, p. 9-27
Other
16
Earth Magnetosphere, Electron Acceleration, Electrons, Shock Fronts, Shock Wave Interaction, Spatial Distribution, Velocity Distribution, Electron Energy, Flux (Rate), Leakage, Magnetic Mirrors, Magnetosheath, Solar Wind
Scientific paper
An overview of the observations of backstreaming electrons in the foreshock and the mechanisms that have been proposed to explain their properties will be presented. A primary characteristic of observed foreshock electrons is that their velocity distributions are spatially structured in a systematic way depending on distance from the magnetic field line which is tangent to the shock. There are two interrelated aspects to explaining the structure of velocity distributions in the foreshock, one involving the acceleration mechanism and the other, propagation from the source to the observing point. First, the source distribution of electrons energized by the shock must be determined along the shock surface. Proposed acceleration mechanisms include magnetic mirroring of incoming solar wind particles and mechanisms involving transmission of particles through the shock. Secondly, the kinematics of observable electrons streaming away from a curved shock with an initial parallel velocity and a downstream perpendicular velocity component due to the motional electric field must be determined. This is the context in which the observations and their explanations will be reviewed.
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