Effects of non-Maxwellian electron velocity distribution functions and nonspherical geometry on minor ions in the solar wind

Details Effects of non-Maxwellian electron velocity distribution functions and nonspherical geometry on minor ions in the solar wind Effects of non-Maxwellian electron velocity distribution functions and nonspherical geometry on minor ions in the solar wind

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.1057b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Feb. 1, 1987, p. 1057-1066.

Physics

20

Charge Distribution, Electron Distribution, Ion Distribution, Maxwell-Boltzmann Density Function, Solar Wind Velocity, Velocity Distribution, Distribution Functions, Solar Temperature, Stellar Models

Scientific paper

A previous model has shown that in order to account for the charge state distribution in the low-speed solar wind, a high coronal temperature is necessary and that this temperature peak goes together with a peak of nx/np in the corona. In the present paper, one of the assumptions made previously, i.e., that coronal electrons are Maxwellian, is relaxed, and a much cooler model is presented, which could account for the same oxygen charge states in the solar wind due to the inclusion of non-Maxwellian electrons. Also, due to a different choice of the coronal magnetic field geometry, this model would show no enhancement of the coronal nx/np. Results of the two models are then compared, and observational tests to distinguish between the two scenarios are proposed: comparison of directly measured coronal Te to charge state measurements in the solar wind, determination of the coronal nx/np measurement of ion speeds in the acceleration region of the solar wind, and measurement of the frozen-in silicon charge state distribution.

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