The Nearly Isotropic Velocity Distributions of Energetic Electrons in the Solar Wind

Details The Nearly Isotropic Velocity Distributions of Energetic Electrons in the Solar Wind The Nearly Isotropic Velocity Distributions of Energetic Electrons in the Solar Wind

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...638.1169l&link_type=abstract

The Astrophysical Journal, Volume 638, Issue 2, pp. 1169-1175.

Astronomy and Astrophysics

Astronomy

5

Sun: Solar Wind

Scientific paper

Observations with Wind and other spacecraft of the solar wind have shown that the velocity distributions of energetic electrons associated with solar impulsive electron events are often nearly isotropic, as shown by Lin et al. and Ergun et al. It is believed that in each case the electrons are originally associated with a flare-associated beam. The issue of interest is: how can a beam of fast electrons evolve into such a final state? This paper offers a theoretical explanation. We attribute the isotropization of the electron beam distribution to nonresonant pitch-angle scattering by enhanced Alfvén waves in the corona and the solar wind. The proposed scenario is demonstrated with test particle calculations.

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