Physics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvl.107t1101m&link_type=abstract
Physical Review Letters, vol. 107, Issue 20, id. 201101
Physics
2
Particle Emission, Solar Wind, Magnetohydrodynamics And Plasmas, Solar Wind Plasma, Sources Of Solar Wind, Mhd Waves, Plasma Waves, Turbulence
Scientific paper
Temperature anisotropy in the solar wind results from a combination of mechanisms of anisotropic heating (e.g., cyclotron-resonant heating and dissipation of kinetic Alfvén waves) and cooling (e.g., Chew-Goldberger-Low double-adiabatic expansion). In contrast, anisotropy-driven instabilities such as the cyclotron, mirror, and firehose instabilities limit the allowable departure of the plasma from isotropy. This study used data from the Faraday cups on the Wind spacecraft to examine scalar temperature and temperature components of protons. Plasma unstable to the mirror or firehose instability was found to be about 3-4 times hotter than stable plasma. Since anisotropy-driven instabilities are not understood to heat the plasma, these results suggest that heating processes are more effective than cooling processes at creating and maintaining proton temperature anisotropy in the solar wind.
Bale Stuart D.
Kasper Justin Christophe
Maruca Bennett A.
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