Computer Science
Scientific paper
Nov 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971p%26ss...19.1505r&link_type=abstract
Planetary and Space Science, Volume 19, Issue 11, p. 1505-1517.
Computer Science
10
Scientific paper
The paper describes the results of total electron content (Nt) derived from Faraday rotation of beacon signals from S66 satellites at Ahmedabad (23°01'N, 72°36'E) for the period November 1964 to April 1969. The daily variations of Nt and of maximum electron density, Nmax, for any season are found to be similar; both showing a minimum at 05 hr and having a broad maximum around 14-16 hr. The range of Nt, i.e. the ratio of maximum to the minimum value, is 15-20 for any of the seasons of low sunspot years. With increasing solar activity, there is almost no change in the annual range for the winter months, while the range during summer months decreases with increasing solar activity. The daily variation of the slab-thickness (τ) shows generally a midday maximum. A predawn peak of τ is also evident in winter months. A comparison of the Nt values at Ahmedabad, Hyderabad and Delhi shows that at any of the stations, the daily minimum value of Nt is highest in summer and least during winter; Ahmedabad values being slightly greater than the values at Delhi. The midday values of Nt at any of the places show two equinoxial peaks within a year. For any particular month, the day-time Nt value is highest at Ahmedabad which is known to be near the crest of the equatorial anomaly. The solar cycle variation of the daily maximum and minimum values of Nt as well as daytime and night-time average values of τ are described for each season of the year.
Rastogi R. G.
Sharma R. P.
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