Computer Science – Numerical Analysis
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..223s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 37, Feb. 1989, p. 223-237. Research supported by SERC.
Computer Science
Numerical Analysis
5
Magnetospheric Instability, Propagation Modes, Wave Propagation, Whistlers, Anisotropic Media, Electrostatics, High Temperature Plasmas, Numerical Analysis, Space Plasmas
Scientific paper
The problem of marginal stability of oblique whistler-mode waves propagating in a hot, anisotropic plasma is considered both within the quasi-longitudinal and quasi-electrostatic approximations. It is pointed out that the most favorable region for quasi-longitudinal whistler-mode instability lies at frequencies omega above the half electron gyrofrequency Omega unless the wave normal angle is very close to zero. In the opposite limiting case, the waves are expected to be excited at omega greater than Omega/2. This can provide a possible explanation of a gap near omega equals Omega/2 in the spectrum of chorus emissions observed in the magnetosphere. Quasi-electrostatic whistler-mode instabilities are expected for values of anistropy which seem to be too large for magnetospheric conditions.
Sazhin Sergei S.
Walker Stephen
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