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Title: Equatorial Radio Scintillations of ATS-6 Beacons-Phase I: Huancayo 1974-75
Authors: Rastogi, R G
Issue Date: Aug-1982
Publisher: NISCAIR-CSIR, India
Abstract: The temporal variations of the amplitude fluctuation of the radio beacons signals on 41,140 and 360 MHz transmitted from the ATS-6 satellite (at 94°W longitude) received at Huancayo, Peru (lat., 12.0°S; long., 75.3°W, dip lat. ION) during the first phase of the ATS-6 programme have been described. Scintillations on 360 MHz were observed only during the nighttime with the maximum average value of about 2 dB peak-to-peak fluctuations. The average scintillations on 140 MHz were very low (less than 0.1 dB) during the sunrise and sunset periods, with a midday maximum of about 0.7 dB and of a premidnight (2100-2400 hrs L1) peak of about 3.5 dB peak-to-peak fluctuations. The general features of scintillations on 41 MHz were similar to those for 140 MHz, the minimum value of scintillation index around sunrise and sunset periods being about 2 dB and the daytime and nighttime peaks being about 5 dB. Scintillations during the nighttime were mostly very low and on some occasions very high, whereas the daytime scintillation values varied randomly around the mean value. The nighttime scintillations were strongest during December (summer) months while the daytime scintiIlations were strongest during the equinoxes. Assuming the scintillation index (SI) to vary with frequency (as S1 f-n, it was found that the exponent, n, was about 1.3 and 1.4 for weak scintillations and systematically approached 0.0 for increasing magnitude of scintillation.
Page(s): 159-168
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.11(4) [August 1982]

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