A generalization of the Rayleigh criterion for atmospheres with both energy and momentum sources: Implications for atmospheric wave propagation through convecting plasma

Details A generalization of the Rayleigh criterion for atmospheres with both energy and momentum sources: Implications for atmospheric wave propagation through convecting plasma A generalization of the Rayleigh criterion for atmospheres with both energy and momentum sources: Implications for atmospheric wave propagation through convecting plasma

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9819235r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A11, p. 19,235-19,241

Computer Science

Sound

2

Atmospheric Energy Sources, Convective Flow, Gravity Waves, Momentum, Plasma Drift, Sound Waves, Stability, Wave Propagation, Positive Feedback, Upper Atmosphere

Scientific paper

A method is presented for calculating the effects of steady and momentum sources on atmospheric wave propagation. This involves evaluating the weak feedback produced by the modulation of the source field by small-amplitude waves. Although the sources may, in practice, depend on a number of the wave field parameters it is only necessary to formally treat the fluid density modulation. This constitutes a generalization of Rayleigh's instability criterion for the generation of sound in heated air. The approach is applied to the propagation of internal gravity waves in a Boussinesq approximation and to high-frequency acoustic waves. In particular, a number of effects associated with the propagation of atmospheric waves through regions of convecting plasma are treated. These cases are relevant to the propagation of internal gravity waves in the F region of the high-latitude ionosphere. Some new theoretical results concerning the damping and stability of ineternal gravity waves in rapidly flowing plasma and under conditions of critical coupling between plasma flow and phase propagation are presented.

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