Three-dimensional analytical model for the spatial variation of the foreshock electron distribution function - Systematics and comparisons with ISEE observations

Details Three-dimensional analytical model for the spatial variation of the foreshock electron distribution function - Systematics and comparisons with ISEE observations Three-dimensional analytical model for the spatial variation of the foreshock electron distribution function - Systematics and comparisons with ISEE observations

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.4155f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 4155-4173.

Physics

85

Earth Atmosphere, Electron Distribution, Satellite Observation, Shock Wave Propagation, Three Dimensional Models, Distribution Functions, Solar Wind, Spatial Distribution, Velocity Distribution

Scientific paper

A model which is consistent with the solar wind and shock surface boundary conditions for the foreshock electron distribution in the absence of wave-particle effects is formulated for an arbitrary location behind the magnetic tangent to the earth's bow shock. Variations of the gyrophase-averaged velocity distribution are compared and contrasted with in situ ISEE observations. It is found that magnetic mirroring of solar wind electrons is the most important process by which nonmonotonic reduced electron distributions in the foreshock are produced. Leakage of particles from the magnetosheath is shown to be relatively unimportant in determining reduced distributions that are nonmonotonic. The two-dimensional distribution function off the magnetic field direction is the crucial contribution in producing reduced distributions which have beams. The time scale for modification of the electron velocity distribution in velocity space can be significantly influenced by steady state spatial gradients in the background imposed by the curved shock geometry.

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