Asymmetric Solar Wind Electron Superthermal Distributions

Details Asymmetric Solar Wind Electron Superthermal Distributions Asymmetric Solar Wind Electron Superthermal Distributions

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...677..676g&link_type=abstract

The Astrophysical Journal, Volume 677, Issue 1, pp. 676-682.

Astronomy and Astrophysics

Astronomy

12

Interplanetary Medium, Sun: Solar Wind

Scientific paper

Electron distributions with various degrees of asymmetry associated with the energetic tail population are commonly detected in the solar wind near 1 AU. By numerically solving one-dimensional electrostatic weak turbulence equations the present paper demonstrates that a wide variety of asymmetric energetic tail distributions may result. It is found that a wide variety of asymmetric tail formation becomes possible if one posits that the solar wind electrons are initially composed of thermal core plus field-aligned counterstreaming beams, instead of the customary thermal population plus a single beam. It is shown that the resulting nonlinear wave-wave and wave-particle interactions lead to asymmetric nonthermal tails. It is found that the delicate difference in the average beam speeds associated with the forward versus backward components is responsible for the generation of asymmetry in the energetic tail.

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