Computer Science
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31.1165m&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 31, Oct. 1983, p. 1165-1170.
Computer Science
5
Magnetopause, Magnetosheath, Magnetospheric Instability, Space Plasmas, Whistlers, Dispersion, Magnetohydrodynamic Stability, Thermal Plasmas
Scientific paper
Whistler mode wave emissions in the magnetosheath, known as lion roars, are thought to be generated by an electron cyclotron instability. Reported satellite data are used to model a magnetosheath medium where lion roars emissions occurred, and the character, absolute or convective, of the associated electron cyclotron instability is studied. A linear hot plasma dispersion equation for parallel and oblique propagation to the static magnetic field is used, and Derfler's frequency cusp criterion is applied to discriminate between absolute and convective instability. The results show that an absolute instability is compatible with experimental data. From the linear temporal growth rate the saturated wave magnetic field is extrapolated, and a good agreement with the measurements is found.
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