Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-22
Astrophys.J.659:L65-L68,2007
Astronomy and Astrophysics
Astrophysics
11 pages, 2 figures, accepted for publication in ApJ Letters
Scientific paper
10.1086/516568
We show that temperature anisotropies induced at a shock can account for interplanetary and planetary bow shock observations. Shocked plasma with enhanced plasma beta is preferentially unstable to the mirror mode instability downstream of a quasi-perpendicular shock and to the firehose instability downstream of a quasi-parallel shock, consistent with magnetic fluctuations observed downstream of a large variety of shocks. Our theoretical analysis of the solar wind termination shock suggests that the magnetic holes observed by Voyager 1 in the heliosheath are produced by the mirror mode instability. The results are also of astrophysical interest, providing an energy source for plasma heating.
Belcher John W.
Kasper Justin Christophe
Liu Ya-Ying
Richardson John D.
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