Unusual electron distribution functions in the solar wind derived from the HELIOS plasma experiment - Double-strahl distributions and distributions with an extremely anisotropic core

Details Unusual electron distribution functions in the solar wind derived from the HELIOS plasma experiment - Double-strahl distributions and distributions with an extremely anisotropic core Unusual electron distribution functions in the solar wind derived from the HELIOS plasma experiment - Double-strahl distributions and distributions with an extremely anisotropic core

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.1093p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Feb. 1, 1987, p. 1093-1101. NASA-supported research.

Other

42

Anisotropic Media, Distribution Functions, Electron Distribution, Solar Wind, Space Plasmas, Stellar Cores, Helios Project, Magnetically Trapped Particles, Particle Collisions, Solar Probes

Scientific paper

Electron distribution functions with unusual features, which have been observed on rare occasions in the solar wind by the Helios probes, are presented. Two examples show a strong symmetric bidirectional anisotropy in the energy regime of the halo up to particle energies of 800 eV (double-strahl distributions). Another example shows an unusually strong bidirectional anisotropy in the energy regime of the core (below 150 eV). The infrequently observed double-strahl distributions provide evidence that magnetic field loops can exist in the solar wind where electrons are trapped. In addition, they provide evidence that in the case of electrons trapped in closed magnetic field structures the break in the energy spectrum separating the core from the halo is produced only by collisions. On the other hand, the class of distribution functions with strongly anisotropic cores indicates that in the case of "open" magnetic field lines the break between core and halo is largely determined both by the interplanetary electrostatic potential and by collisions.

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