Fresnel-type fading on satellite records at low latitudes

Details Fresnel-type fading on satellite records at low latitudes Fresnel-type fading on satellite records at low latitudes

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jatp...37.1109k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 37, Aug. 1975, p. 1109-1116.

Physics

6

Data Recording, Fresnel Diffraction, Ionospheric Propagation, Satellite Transmission, Signal Fading, Tropical Regions, Diffraction Patterns, Diurnal Variations, F Region, Ground Stations, Sporadic E Layer, Synchronous Satellites

Scientific paper

Fresnel-type fading patterns have been observed on recordings of geostationary and traveling satellites made at three low-latitude stations in East Africa. The occurrence is greatest in the time periods 05-08 and 18-22 local time, at the June solstice. The patterns seem to be produced by patches of increased ionization some 1.5-25 km in extent at heights corresponding to sporadic-E levels and the lower F-region. The sizes show an increase with height. On occasions the patterns exhibit repetition with intervals of 4-30 min. The equations used in determining the height of the patches are reviewed. The results are compared with those from middle latitudes. A possible connection with sporadic-E is discussed.

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