Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..167c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Feb. 1992, p. 167-172.
Physics
7
Earth Ionosphere, Satellite Observation, Scintillation, Spread F, Synchronous Satellites, India, Periodic Variations, Power Spectra, Radio Beacons, Very High Frequencies
Scientific paper
VHF intensity scintillations associated with equatorial spread-F were recorded at SHAR (dip 13 deg N), India, using the 136.1 MHz beacon from the geostationary satellite ETS-2. The observations were made during the periods 12 March-26 April, 1986 and later from 15 September to 5 October 1988. The maximum hourly occurrence frequency of scintillations was about 50 percent during March 1986 and 30 percent during April 1986. It increased to about 85 percent during September-October 1988. The onset time of scintillations was generally between 20 and 21 h IST (77.5 deg E) during 1986 and between 1900 and 1930 h IST during 1988. Scintillations lasted for a longer duration of night in 1988 than in 1986. Data for a few nights were analyzed to study the temporal variation of the scintillation index, computed at close time intervals. Wavelike fluctuations with a dominant periodicity of about 1 h and another periodicity of about 20 min were seen. Power spectra were studied for 225 data samples of 100 s duration each for the night of 4-5 October 1988.
Chandra Harish
Misra R. N.
Prakash Suprabh
Sinha S. S. H.
Vyas G. D.
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