Computer Science – Sound
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.1569f&link_type=abstract
Journal of Geophysical Research, vol. 86, Mar. 1, 1981, p. 1569-1575.
Computer Science
Sound
21
Atmospheric Scattering, Equatorial Electrojet, Ionospheric Sounding, Radar Cross Sections, Radar Scattering, Scattering Cross Sections, Electromagnetic Absorption, Incoherent Scattering, Irregularities, Power Spectra, Radar Attenuation, Radio Echoes, Riometers, Signal To Noise Ratios
Scientific paper
Carefully calibrated radar scattering measurements have been made using the large 50-MHz Jicamarca antenna. Typical results from the altitudes of maximum echo power for the vertically directed beam are cross sections of about 1-2 x 10 to the -10th/m for strong daytime electrojet conditions with type 1 irregularities present, with values a factor of 10 or so smaller during moderate conditions when only type 2 are observed. These cross sections, which are very large in comparison with those for incoherent scatter (cross sections of about 5 x 10 to the -18th/m for an electron density of 10 to the 11/cu m), are not nearly large enough, however, to cause pseudo-absorption events on riometer records, as was suggested by D'Angelo in 1976. If a model for the wave number dependence of the irregularities is assumed, it is possible to relate the radar data, which correspond to a single point in vector wave number-space, to in situ measurements of the magnitude of the total density fluctuations which correspond to a single point in physical space (an integral over the vector wave number-spectrum). The comparisons are reasonable, but depend significantly upon the assumed large scale cutoff for type 2 irregularities and the small scale cutoff for type 1.
Farley Donald T.
Fejer Bela G.
Ierkic Mario H.
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