Velocity distributions of superthermal electrons fitted with a power law function in the magnetosheath: Cluster observations

Details Velocity distributions of superthermal electrons fitted with a power law function in the magnetosheath: Cluster observations Velocity distributions of superthermal electrons fitted with a power law function in the magnetosheath: Cluster observations

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11603224l&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A3, CiteID A03224

Physics

Plasma Physics

2

Magnetospheric Physics: Magnetosheath, Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Space Plasma Physics: Charged Particle Motion And Acceleration

Scientific paper

Satellite observations have revealed that superthermal electrons in space plasma generally possess a power law distribution. In this paper, we utilize a power law function to model the omnidirectional differential fluxes of superthermal electrons observed by Cluster in the magnetosheath. By assuming an isotropic pitch angle distribution and performing a nonlinear least squares fitting, we can calculate the index α of the power law distribution of the superthermal electrons. We found that in the magnetosheath the indices α of the power law distributions decrease with the increase of ωpe/Ωe. It is consistent with the results of the recent particle-in-cell simulations, which described the electron distributions scattered by enhanced whistler waves. This is the first reported observation of this relation in space plasma.

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