Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415373a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15373-15383. Research supported by Los Alamos Nation
Physics
25
Boundary Layers, Electromagnetic Interactions, Ion Temperature, Magnetohydrodynamic Stability, Plasma Drift, Earth Magnetosphere, High Temperature Plasmas, International Sun Earth Explorers, Plasma Density
Scientific paper
Plasma and magnetic field data observed during two ISEE crossing of the plasma sheet boundary layer are studied in conjuction with a linear theory analysis. The plasma distribution functions exhibit three distinct potential sources of free energy: ion/ion relative drifts, electron/ion relative drifts corresponding to nonzero field-aligned current, and large ion temperature anistropies. These observed distributions are used as source functions in a linear Vlasov theory of electromagnetic instabilities at propagation parallel or antiparallel to the average magnetic field. The theory shows that the field-aligned current gives rise to the low frequency kinklike instability, and anisotropies of the flowing ion components give rise to two distinct branches of the ion cyclotron anisotropy instability with spacecraft frame frequencies both below and above the proton cyclotron frequency Omega (p). Analysis of the magnetic field data demonstrates that the appearence of two fast, counterstreaming, anisotropic ion components corresponds to a significant increase in the magnetic fluctuation energy density both below and above Omega(p), in full agreement with the theoretical predictions.
Angelopoulos Vassilis
Elphic Richard C.
Gary Peter S.
Huang Cheryl Y.
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