Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49.1107b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Nov.-Dec. 1987, p. 1107-1117. DOE-NASA-sponsored resea
Physics
22
Electrostatic Waves, Ionospheric Heating, Magnetohydrodynamic Stability, Plasma-Electromagnetic Interaction, Plasmons, Radio Frequency Heating, Airglow, Carbon Dioxide, Digital Simulation, Electron-Ion Recombination, Ionospheric Electron Density
Scientific paper
Ionospheric modification by high power radio waves and by chemical releases are combined in a theoretical study of ionospheric focused heating. The release of materials which promote electron-ion recombination creates a hole in the bottomside ionosphere. The ionospheric hole focuses high power radio waves from a ground-based transmitter to give a 20 dB or greater enhancement in power density. The intense radio beam excites atomic oxygen by collisions with accelerated electrons. Airglow from the excited oxygen provides a visible trace of the focused beam. The large increase in the intensity of the radio beam stimulates new wave-plasma interactions. Numerical simulations show that the threshold for the two-plasmon decay instability is exceeded. The interaction of the pump electromagnetic wave with the backward plasmon produces a scattered electromagnetic wave at 3/2 the pump frequency. The scattered wave provides a unique signature of the two-plasmon decay process for ground-based detection.
Bernhardt Paul A.
Duncan L. M.
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