The radial gradients and collisional properties of solar wind electrons

Details The radial gradients and collisional properties of solar wind electrons The radial gradients and collisional properties of solar wind electrons

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3776o&link_type=abstract

Journal of Geophysical Research, vol. 83, Aug. 1, 1978, p. 3776-3782.

Physics

9

Collision Parameters, Electron Density (Concentration), Electron Distribution, Electron Energy, Electron Scattering, Solar Electrons, Solar Wind, Density Distribution, Electron Radiation, Interplanetary Medium, Mariner Spacecraft, Plasma Probes, Radial Distribution, Solar Activity, Solar Corona, Temperature Distribution

Scientific paper

The plasma electron detector on Mariner 10 is used to obtain measurements of electron density and temperature in the interplanetary medium between heliocentric distances of 0.85 and 0.45 AU. The observations show quantitatively that the core of the electron distribution function can be described as collisional at least for radial distances within 1 AU, since with a very few well-marked exceptions associated with high-speed streams, the Coulomb collisional momentum relaxation length is less than the density scale height at all times and all radial distances at which data were obtained. It is found that the Coulomb energy exchange collisions between the core and the (test) halo population are negligible. The power law exponent of the core temperature is about -0.3, whereas the halo temperature is almost independent of heliocentric distance.

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