Electron Anisotropy Constraint in the Solar Wind

Details Electron Anisotropy Constraint in the Solar Wind Electron Anisotropy Constraint in the Solar Wind

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh53a1482s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH53A-1482

Physics

Plasma Physics

2164 Solar Wind Plasma, 7800 Space Plasma Physics

Scientific paper

We present a statistical study of solar wind electrons using data from several spacecrafts missions (HELIOS-I, CLUSTER-II and ULYSSES) collected in the ecliptic plane covering the radial distance from the Sun from 0.3 up to 4 AU. We focused on the electron temperature anisotropy which control mechanisms are still not well understood. For this purpose we looked at the temperature anisotropy as a function of two important parameters, namely the electron collisional age A_e defined as a number of collision suffered by an electron during the expansion of the solar wind and the electron parallel plasma beta β||, to see whether the electrons are constrained by some instabilities or driven by collisions. The radial evolution of these relations were also examined. The temperature anisotropy was computed by fitting the measured electron velocity distribution functions (eVDF) with a core-halo model defined as a sum of a bi-Maxwellian and a bi-Kappa function representing the core and halo population respectively.

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