Physics
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.2172w&link_type=abstract
Journal of Geophysical Research, vol. 80, June 1, 1975, p. 2172-2182.
Physics
6
Auroral Zones, Crossed Fields, E Region, Ionospheric Disturbances, Magnetohydrodynamic Stability, Plasma Waves, Atmospheric Models, Auroral Echoes, Ionospheric Propagation, Kinetic Theory, Phase Velocity, Propagation Modes
Scientific paper
The off-perpendicular propagation characteristics of plasma waves generated by the Buneman-Farley (1963) two-stream plasma instability are determined using a fluid plasma model appropriate for the ionospheric E region. The model takes into account the effects of the geomagnetic field and electron and ion temperatures and their collisions with neutrals. A linearized dispersion equation for the coupled electron thermal wave and ion thermal wave is obtained from which closed-form expressions are derived for determining the phase velocities, frequencies, and growth rates for the threshold condition and the unstable region. It is shown that unstable plasma waves of maximum growth rate propagate at finite off-perpendicular angles with respect to the geomagnetic field, that radar auroral echoes scattered from these waves should occur at finite off-perpendicular angles, and that at long wavelengths there is an exact agreement between the described fluid theory and a kinetic theory.
Tsunoda Roland T.
Wang N. C. T.
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