Physics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.273..285r&link_type=abstract
Nature, vol. 273, May 25, 1978, p. 285-287. Research supported by the Department of Space of India
Physics
1
Ats 6, Ionospheric Propagation, Radio Frequencies, Scintillation, Signal Fading, Spacecraft Communication, F Region, Radio Beacons, Satellite Television, Time Dependence, Ultrahigh Frequencies, Very High Frequencies
Scientific paper
The variation with frequency of ionospheric scintillations, simultaneously observed at 40, 140, 360, and 860 MHz at equatorial latitudes, was studied. The ATS 6 geostationary satellite was equipped with radio beacons at 40, 140, and 360 MHz, and also with a television downlink at 860 MHz. The signals were recorded at Ootacamund, India (dip 4 deg N) and were most common between 2000 and 2300 LT. It was found that the spectral index of an expression used by Aarons et al (1967) was not constant but decreased with increasing magnitude of scintillations. For weak scintillations the spectral index (referred to as the exponent) was found to be close to 1.0. The analysis of the records involved scaling at 15-sec intervals and the calculation of the average scintillation index.
Davies Kenneth
Deshpande M. R.
Parikh P. B.
Rastogi R. G.
Vadher N. M.
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