Physics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31..285h&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 31, March 1983, p. 285-293.
Physics
4
Auroral Zones, Current Sheets, Electrostatic Waves, Plasma Currents, Eigenvalues, Ion Acoustic Waves, Wave Propagation
Scientific paper
Calculations for the threshold of current-driven instabilities and the growth rates of ion acoustic and electrostatic ion cyclotron instabilities in a magnetized plasma driven a current sheet with a finite width are presented. Maxwellian equations are employed to model the velocity distributions of electrons and ions in a direction perpendicular to the sheet. A dispersion relation is defined for the regions of instability, and boundary conditions are characterized in order to obtain a set of eigenvalue equations. Thresholds are delineated for various regions, including ducted mode solutions where only ion-acoustic waves are excited in areas where the frequency range significantly exceeds the ion cyclotron frequency. When a constant electron drift velocity is present, a thick current sheet is more unstable than a thin one. Fewer modes become unstable with a thinner sheet.
Fontheim Ernest G.
Hwang K. S.
Ong S. B. R.
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