Physics – Space Physics
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ijrsp...7...16i&link_type=abstract
Indian Journal of Radio and Space Physics, vol. 7, Feb. 1978, p. 16-21. Research supported by the Department of Space of India.
Physics
Space Physics
Annual Variations, Diurnal Variations, Faraday Effect, Ionospheric Electron Density, Magnetic Equator, Satellite Transmission, Nocturnal Variations, Solar Activity Effects, Solar Flux, Sunspots, Tropical Regions
Scientific paper
The total electron content (TEC) in the ionosphere using Faraday rotations of S66 satellites for the equatorial-latitude station, Kodaikanal, is described. The daily variation of TEC shows a minimum around 0400-0500 hrs LT and a maximum around 1400-1600 hrs LT. There is no indication of noon bite-out in TEC except during the summer of high-sunspot years. The equivalent slab thickness is about 200 km during nighttime hours and about 400 km around midday hours. The ratio of TECs in top and bottom layers of the ionosphere is about 2.0 during daytime hours. In the nighttime of high-sunspot years this ratio exceeds 4.0. Both the slab thickness and TEC show equinoctial maxima. The TEC shows a linear positive relationship with solar flux, but the slab thickness is rather constant with changes in solar flux.
Iyer K. N.
Rastogi R. G.
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