Electron Anisotropy Constraint in the Magnetosheath: Cluster Observations

Details Electron Anisotropy Constraint in the Magnetosheath: Cluster Observations Electron Anisotropy Constraint in the Magnetosheath: Cluster Observations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51c1413g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM51C-1413

Other

2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

The whistler anisotropy instability is driven by the condition T\perp e/T∥ e > 1, where the subscript e denotes electrons and the other subscripts denote directions relative to the background magnetic field B_o. Instability growth leads to enhanced field fluctuations which scatter the electrons; theory and simulations show that this scattering imposes an upper bound on the electron anisotropy in the form T\perp e/T∥ e - 1 = S_e/β∥ e^{\ α_e} with fitting parameters 0.1 \ltape S_e \ltape 1 and 0.5 \ltape α_e < 0.7 over 0.10 ≤ β∥ e ≤ 1.0 where β∥ e ≡ 8 π n_e T∥ e/B_o2. Measurements from the PEACE instrument on the Cluster 1 spacecraft [Gary et al., 2005] have shown that electron anisotropies in two crossings of the dayside terrestrial magnetosheath are constrained statistically by this equation with S_e ~eq 0.2. Here we describe further research on this topic using Cluster observations; we have considered a broader data base of magnetosheath crossings and have also examined magnetic fluctuation data to seek correlations between enhanced whistler wave activity and constrained electron anisotropies. Gary, S. P., B. Lavraud, M. F. Thomsen, B. Lefebvre, and S. J. Schwartz (2005), Electron anisotropy constraint in the magnetosheath: Cluster observations, \grl, 32, L13109, doi:10.1029/GL023234.

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