Proton pitch angle diffusion rate and wave turbulence characteristics in the magnetosheath plasma

Details Proton pitch angle diffusion rate and wave turbulence characteristics in the magnetosheath plasma Proton pitch angle diffusion rate and wave turbulence characteristics in the magnetosheath plasma

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1402p&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A11, pp. SMP 35-1, CiteID 1402, DOI 10.1029/2001JA009149

Physics

1

Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers

Scientific paper

Results of the analysis of variations of the proton temperature anisotropy (A) across the magnetosheath along with some plasma wave turbulence characteristics are discussed. It is shown that the deviation of the observed values of A from the bounded anisotropy model may be explained by a finite value of the temperature isotropization time τ. In turn, the obtained values of τ have a tendency to decrease with the increase of the intensity of the magnetic field oscillations. The discovered dependence of τ on the intensity of mirror-wave-like turbulence seems to confirm the supposition by Hill et al. [1995] on a significant role of mirror waves in the pitch angle scattering of protons in the magnetosheath plasma. It is shown that the observed periods of abnormally low values of A in some cases correspond to the periods of relatively high intensive magnetic field oscillations, most probably of an external origin.

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