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Title: Early Results of ATS-6 Radio Beacon Experiment at New Delhi
Authors: Garg, S C
Vijayakumar, P N
Singh, Lakha
Tyagi, T R
Somayajulu, Y V
Issue Date: Sep-1977
Publisher: NISCAIR-CSIR, India
Abstract: Faraday rotation and amplitude of the 140 MHz radio beacon from the ATS-6 geostationary satellite have been continuously recorded at New Delhi (28.63°N; 77.22°E) since August 1975 when the satellite was repositioned at 35°E longitude. The diurnal variation of the overhead electron content for the period Oct. 1975-July 1976 at New Delhi is described based on the diurnal curves for several quiet days for each month. These are compared with the average features derived for similar solar activity using orbiting satellites. One of the features is the absence of winter anomaly during low solar activity conditions. It has been further noted that the TEC values are independent of magnetic activity. These are also independent of solar activity up to about 85 units of S10.7 solar flux. During the period of observation several solar flare events occurred and two of them produced sudden increase of total electron content (SITEC) of the order of 3-7%. One solar flare event has apparently triggered, apart from a SITEC, amplitude scintillation which lasted for about 1 hr. Several travelling ionospheric disturbances (TIDs) were also observed during this period. During Oct. and Nov. 1975, TIDs were regularly observed during 0900-1100 hrs. Several non-periodic medium and large scale irregularities were also detected.
Page(s): 190-196
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.06(3) [September 1977]

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