Large-scale variations of thermal electron parameters in the solar wind between 0.3 and 1 AU

Details Large-scale variations of thermal electron parameters in the solar wind between 0.3 and 1 AU Large-scale variations of thermal electron parameters in the solar wind between 0.3 and 1 AU

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6305p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6305-6329. Research supported by NASA.

Physics

39

Electron Energy, Hot Electrons, Interplanetary Magnetic Fields, Solar Corona, Solar Electrons, Solar Wind, Electron Distribution, Helios 2, Solar Cycles, Variability

Scientific paper

Variations of thermal electron parameters in the solar wind are studied at heliocentric distances from 0.3 to 1 AU using Helios data from 1974 to spring 1976 just before solar minimum. Consideration is given to variations across plasma streams and across the sector structure of the IMF. It is found that, in high-speed streams in the interior of magnetic sectors, the electron temperatures are relatively low and strongly anisotropic. The electron temperatures become larger and less anisotropic toward sector boundaries in the slow solar wind. Radial gradients for the thermal electron parameters and polytrope indices for the core temperatures and electron temperatures are studied. Evidence is presented that the electrons in high-speed streams are heated by external heat sources. Interplanetary electrostatic potential differences caused by the thermal electron pressure gradients are estimated to be between 30 and 90 V.

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