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|Title:||TEC and Equivalent Slab-Thickness at Low & Midlatitudes A Comparative Study|
|Authors:||Prasad, D S V V D|
Rao, P V S Rama
|Abstract:||Using the simultaneous data of TEC recorded at Waltair(17.7ᵒN) and Tokyo (35.7ᵒN) during the high solar activity period of March 1978 to December 1978 at 136.1123 MHz from the ETS-II satellite, a comparative study of the variations in the diurnal and seasonal characteristics in TEC and the equivalent slab .thickness were studied. In general, the level of ionization both during day and night at the low latitude station, Waltair, is much higher (30-40%) than that at the midlatitude station, Tokyo. At Waltair there is a significant maintenance of nighttime ionization with a short-lived (around 0500 hrs) day minimum as compared to a long duration day minimum (2200 to 0500 hrs) at Tokyo. The post-sunset increases in TEC observed at Waltair are not seen at Tokyo. The seasonal variation in the build-up and decay rates of ionization and the day maximum values in TEC at both the locations exhibit a significant semi-annual variation with equinoxial peaks around April and October. The equivalent slab thickness () at Waltair shows an irregular diurnal variation in contrast to a nearly constant (around 250 km) value of at Tokyo in all the seasons. Significant early morning increases in observed at Waltair are attributed to the earlier illumination of the topside of the ionosphere preceded by a significant decrease in the peak electron density of the F-layer, particularly, in the equatorial region.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.16(4) [August 1987]|
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