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Title: Scintillation Studies Using ATS-6 Radio Beacons at Delhi
Authors: Somayajulu, Y V
Garg, S C
Vijayakumar, P N
Issue Date: Sep-1977
Publisher: NISCAIR-CSIR, India
Abstract: Salient features of scintillations on 40 and 140 MHz ATS-6 satellite radio beacons recorded at Delhi (28·6°N; 77·22°E) from Aug. 1975 to July 1976 are presented. The scintillation data are grouped into daytime and nighttime scintillations. Diurnal and seasonal behaviour in the occurrence of these scintillations, scintillation index and scintillation rate are studied. The daytime scintillations show statistical correlation with sporadic-E (f0E5 5 MHz) and possess low scintillation rate ~ 1 to 4 fades per min. It is concluded that these scintillations are caused by disturbances in both E- and F-regions. The nighttime activity was found to be most severe during summer months and minimum during equinoxes. The onset is found to be about 1-2 hr after sunset with the activity building up sharply. The peak is mostly observed around midnight, the fall in the activity being gradual extending up to several hours in the early morning. The scintillation rate observed is ~ 1 to 3 fades per min and is in accordance with the rate associated with F-region scintillations. The spectral index of scintillation activity is derived for the two frequencies 40 and 140 MHz and is found to be ~ 0.5, for S4 index less than 0.5.
Page(s): 250-256
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.06(3) [September 1977]

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