Observations of electron beams in the low-latitude boundary layer

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Electron Beams, Magnetospheric Electron Density, Space Plasmas, Density Distribution, Distribution Functions, Electron Distribution, Electron Spectroscopy, International Sun Earth Explorer 1, Magnetosheath, Three Dimensional Models

Scientific paper

ISEE 1 electron spectrometer observations are used to study the electron distribution function in the low latitude boundary layer (LLBL) of the magnetosphere in the sunward direction. The study included 43 examples of well-defined layers. Using three-dimensional, model-independent distribution functions of electrons observed in the boundary layer, beams of field-aligned electrons with typically 100 eV energy maximums, streaming in either one, or both, directions have been identified. The phase densities in the LLBL and at lower altitudes are similar, and the beams observed in the LLBL are identified with those observed at lower altitudes. They form an important component of the plasma electrons in the LLBL, which otherwise resembles a mixture of magnetosheath-like and magnetospheric electrons.

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