Physics – Plasma Physics
Scientific paper
2010-02-11
Astrophysical Journal 710 (2010) 1848-1856
Physics
Plasma Physics
This is an author-created, un-copyedited version of an article accepted for publication in Astrophysical Journal. IOP Publishi
Scientific paper
10.1088/0004-637X/710/2/1848
We perform fully-kinetic particle-in-cell simulations of an hot plasma that expands radially in a cylindrical geometry. The aim of the paper is to study the consequent development of the electron temperature anisotropy in an expanding plasma flow as found in a collisionless stellar wind. Kinetic plasma theory and simulations have shown that the electron temperature anisotropy is controlled by fluctuations driven by electromagnetic kinetic instabilities. In this study the temperature anisotropy is driven self-consistently by the expansion. While the expansion favors an increase of parallel anisotropy ($T_\parallel>T_\perp$), the onset of the firehose instability will tend to decrease it. We show the results for a supersonic, subsonic, and static expansion flows, and suggest possible applications of the results for the solar wind and other stellar winds.
Burgess David
Camporeale Enrico
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