Radio wave heating and equatorial spread-F

Details Radio wave heating and equatorial spread-F Radio wave heating and equatorial spread-F

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49.1071l&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Nov.-Dec. 1987, p. 1071-1074.

Physics

7

Equatorial Atmosphere, Ionospheric Propagation, Radio Frequency Heating, Spread F, Taylor Instability, Wave Interaction, Diamagnetism, Earth Ionosphere, High Frequencies, Magnetic Fields, Plasma Density

Scientific paper

High frequency radio waves passing through the F-region of the ionosphere can modify the spectrum of spread-F irregularities via a four-wave parametric interaction. Nonlinear coupling arises through the thermal gradient force. The growth rate is a sensitive function of the angle theta between the wave vectors of the incident wave and the Rayleigh-Taylor mode. HF waves propagating in a very narrow cone around theta = pi/2 tend to enhance the growth rate, whereas HF waves outside this cone have a strong stabilizing influence (when cos theta is greater than k/2k sup 0). The threshold effective radiated power for the suppression of the mode increases with decreasing theta.

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