Characteristics of electron velocity distribution functions in the solar wind derived from the HELIOS plasma experiment

Details Characteristics of electron velocity distribution functions in the solar wind derived from the HELIOS plasma experiment Characteristics of electron velocity distribution functions in the solar wind derived from the HELIOS plasma experiment

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.1075p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Feb. 1, 1987, p. 1075-1092. NASA-supported research.

Physics

113

Electron Distribution, High Temperature Plasmas, Solar Wind, Space Plasmas, Velocity Distribution, Data Processing, Electron Energy, Heat Flux, Helios 2, Solar Probes

Scientific paper

The details of the shapes of three typical electron distribution functions observed by the Helios 1 and 2 probes in the solar wind between 0.3 AU and 1 AU are analyzed and compared with theoretical predictions. These are (1) a distribution function with a narrow 'strahl' (narrow beam), which is extremely anisotropic and skewed with respect to the magnetic field direction at particle energies above 100 eV; (2) a distribution function with a broad 'strahl', less anisotropic and skewed; and (3) a nearly isotropic distribution function. For each distribution function, a sudden change in the slope was discerned, separating the 'core' at lower energies from the 'halo' at higher energies. The most obvious differences of the analyzed electron distribution functions were observed at energies above 50-100 eV. The possible origins for the observed features of the distribution functions are discussed.

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