Consequences of the large ambipolar electric field in the solar wind

Details Consequences of the large ambipolar electric field in the solar wind Consequences of the large ambipolar electric field in the solar wind

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.confr..37s&link_type=abstract

Iowa Univ., International Solar Wind 8 Conference, p. 37

Physics

Solar Wind, Electric Fields, Electron Distribution, Velocity Distribution, Solar Physics, Sun, Distribution Functions, Heat Transfer, Dichotomies

Scientific paper

The parallel electric field in the solar wind is much smaller than the V x B motional electric field, yet in the proper dimensions units it is very 'large'. At the orbit of earth it is within a few percent of being at the Dreicer limit. This 'large' electric field is required for quasi-neutrality; it will be shown to have interesting consequences for the electron velocity distribution function and the description of transport of heat. Interestingly, a similar dimensionless situation also occurs at the base of the transition region, while below the transition region the dimensionless electric field is very weak. These facts suggest a new way to look at the thermal-suprathermal dichotomy in velocity distributions as the response of a plasma where charge neutrality requires such large dimensionless electric fields.

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