Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51b0816s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM51B-0816
Physics
0654 Plasmas, 0689 Wave Propagation (4275)
Scientific paper
The linearized dispersion relation describing waves in a plasma having a uniform magnetic field, uniform density, and shear in parallel (to the field) flow [G. Ganguli, M.J. Keskinen, H. Romero, R. Heelis, T. Moore, and C. Pollock, J. Geophys. Res., 99, 8873, 1994.] is generalized to include thermal anisotropy, a key feature existing in many space and laboratory plasmas. The effects of thermal anisotropy on the ion acoustic mode and the ion cyclotron mode are examined. The growth rate of the ion acoustic mode is shown to increase with the ion perpendicular to parallel temperature ratio, and the real frequency at which the maximum growth rate occurs is shown to upshift significantly. The angle that an ion acoustic wave propagates is also shown to depend on the temperature ratio. The growth rate for the ion cyclotron mode is shown to increase with the perpendicular to parallel ion temperature ratio in the presence of inhomogeneous flow, and the real frequency is not significantly affected. Also presented is a generalized calculation of perturbed distribution functions [Sarfaty, M., S. DeSouza Machado, F. Skiff, Phys. Plasmas, 3, 4316, (1996); Skiff, F., IEEE Transactions of Plasma Science, 20, 701 (1992)] to include shear in field-aligned flow. Without shear, the first order perturbed distribution as a function of is independent of the orientation of the wavevector in the plane perpendicular to the background magnetic field. A method of determining the wavevector components present in a plasma with shear in the parallel flow is presented. The new results are applicable to the FAST mission.
Ganguli Gurudas I.
Scime Earl E.
Spangler Steven R.
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