Analysis of a long period fading component in saturated VHF amplitude scintillation observed at Ascension Island

Details Analysis of a long period fading component in saturated VHF amplitude scintillation observed at Ascension Island Analysis of a long period fading component in saturated VHF amplitude scintillation observed at Ascension Island

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49..421f&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, May 1987, p. 421-431.

Physics

2

Equatorial Regions, Scintillation Counters, Signal Fading Rate, Temporal Distribution, Very High Frequencies, Islands, Marisat Satellites, Signature Analysis

Scientific paper

Previous studies of saturated VHF amplitude scintillations on geostationary satellite beacon signals measured at Ascension Island have shown that the temporal coherence time of the saturate scintillation is generally on the order of several tenths of a second in the postsunset to premidnight period. In this paper it is shown that this rapid fading is accompanied by slow fluctuations on time scales on the order of several minutes having peak to peak amplitudes of about 6 dB. These fluctuations are associated with the scale sizes in the diffraction pattern on the ground that are more than 10 times the Fresnel dimension. A characteristic long period fading signature often present at the very beginning and end of a patch, is consistent with what is expected for a wave encountering the sharp, vertically elongated edge of a large scale depletion in electron density. In addition, a composite fading spectrum covering 4.5 decades in frequency is shown to agree closely with strong scintillation model spectra computed using a two component power-law spectrum model for the ionospheric irregularites.

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