Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh21a0297c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH21A-0297
Physics
2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
We present a study of the kinetic properties of the electron velocity distribution functions in the solar wind to model the electron heat-flux and temperature anisotropy, to investigate the stability of electron to the excitation of whistler waves. The study is based on high time resolution data from the Cluster/PEACE electron spectrometer. Our study focused in the mechanisms that control and regulates whistler electron instabilities in the solar wind. These mechanisms are not well understood. We investigate the electron heat-flux and temperature anisotropy as a function of two important parameters, namely the electron parallel plasma βe\Vert and the electron collisional age Ae defined as the number of collisions suffered by an electron during the expansion of the solar wind. The goal is to check whether the electrons are constrained and regulated by some instability (e.g., the whistler instability), or are driven by collisions. The electron heat-flux and temperature anisotropy are determined by moments of the velocity distribution functions (VDF) and/or model fitting of the electron VDF using a superposition of a bi-Maxwellian core distribution, bi-Kappa halo and strahl distributions.
Chinchilla T. N.
Goldstein Michel L.
Viñas Adolfo F.
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