Computer Science – Numerical Analysis
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997kfnt...13a..24k&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 13, p. 24
Computer Science
Numerical Analysis
Solar Atmosphere, Magnetohydrodynamic Stability, Landau Damping, Coulomb Collisions, Solar Flares, Electric Fields, Photosphere
Scientific paper
A specific type of plasma instability of oblique Bernstein modes with a small but nonzero longitudinal component of the wave vector is considered. It is assumed that the main source of instability of the pure electron mode m = 1 under consideration is a large-scale quasi-static electric field which is parallel to the external magnetic field. Quasi-static variation of the field amplitude in time permits the realization of a relatively simple mechanism of the direct initiation of instability by the electric field. A modified dispersion relation for mode m = 1 is obtained with allowance for the influence of the external electric field, Landau damping, and pair Coulomb collisions. To describe the latter, the model collision integral of Bhatnagar-Gross-Krook is used. An expression for the growth rate is obtained. Numerical analysis of the expression is performed for plasmas with characteristics typical for postflare loops and prominences.
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