Physics – Optics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9521179f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Dec. 1, 1990, p. 21179-21186.
Physics
Optics
1
High Frequencies, Ionospheric Electron Density, Ionospheric Heating, Caustics (Optics), Field Aligned Currents, Magnetohydrodynamic Stability, Spread F
Scientific paper
A parameter study is used to illustrate the signal changes that might be caused by powerful HF transmitters and the effects measured in the Bochkarev study are explained. Calculations of ionospheric electron temperature and density perturbations and of ground-level signal changes produced by intense oblique high-frequency radio waves are presented. The analysis accounts for Joule heating of the surrounding plasma, heat conduction, diffusion, and recombination processes, as these things are the products of an oblique 'modifying' wave. Effects are then sought on a secondary 'test' wave, which is propagated along the same path as the first. The test wave could, in fact, be the modifying wave itself, in which case the calculation would be the 'self-effect' of a powerful transmitter. Calculations predict ground-level field strength reductions of several decibles in the test wave for modifying waves having effective radiated power in the 85- to 90-dBW range, with field strength changes being similar to the Soviet experiment.
Bloom Ronald M.
Field Edward C. Jr.
Kossey Paul A.
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