Physics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.280..151f&link_type=abstract
Royal Society (London), Philosophical Transactions, Series A, vol. 280, no. 1293, Oct. 23, 1975, p. 151-165.
Physics
8
Electrostatic Waves, F 2 Region, Ionospheric Propagation, Radio Echoes, Spread F, Airglow, Electromagnetic Absorption, Frequency Response, Ionograms, Ionospheric Electron Density, Magnetohydrodynamic Stability, Plasma Density, Radio Scattering, Ultrahigh Frequencies
Scientific paper
In recent years powerful radio wave transmissions beamed at the ionosphere at frequencies somewhat below the penetration frequency of the F2 layer produced the following, mostly unexpected, spectacular effects: (1) artificial spread F seen on ionograms and implying the presence of large scale field-aligned irregularities in the ionospheric plasma density; (2) very strong additional absorption of probing waves reflected by the F2 layer; (3) field-aligned 'on frequency' scattering of UHF waves; (4) scattering of UHF waves by Langmuir waves which are believed to be parametrically excited; (5) the 630 nm airglow is artificially enhanced by a modifying wave of ordinary polarization but it is reduced in intensity by a modifying wave of extraordinary polarization; (6) the shape of the F2 layer is modified. The results of the observations are described and their tentative interpretation in terms of different parametric instabilities is outlined.
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