Trapped electron distributions on open magnetic field lines

Physics

Scientific paper

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Electron Distribution, Geomagnetism, Lines Of Force, Magnetically Trapped Particles, Magnetopause, Space Plasmas, Energetic Particles, Field Strength, Ion Distribution, Magnetosheath, Satellite Observation

Scientific paper

An investigation is undertaken of the concept that the apparently trapped electron distributions, coexisting with streaming ion distributions, observed by the ISEE spacecraft's September 8, 1978 magnetopause crossing may be due to the trapping of electrons by magnetic mirroring from the field in the magnetosheath. The loss cone angle predicted from the instantaneously measured magnetic field and the observed minimum field in the magnetosheath compares well with the observed loss cone angles. It is suggested that the ions are not similarly reflected because they fail to meet the adiabatic condition during passage through the magnetopuase. This resolution of conflicts between field line topology predictions based on electrons and ions supports the interpretation of the September 8, 1978 ISEE crossing of the magnetopause as a reconnection event.

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