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|Title:||Characteristics of travelling ionospheric disturbances observed in total electron content over Waltair|
|Authors:||Rao, P V S Rama|
Prasad, D S V V D
|Abstract:||Continuous data of total electron content (TEC) obtained at Waltair (17.7°N, 83.3°E) during the low sunspot activity period of 1983-85 have been used to study the diurnal and seasonal variations of travelling ionospheric disturbances (TIDs). The level of occurrence is markedly higher in winter than in summer. The onset time in the occurrence of TIDs is generally found to be around 0800- 0900 hrs LT in all the three different seasons. The diurnal variation has its maximum around 1600 hrs LT both in winter and summer. During the equinoctial months, the occurrence of TIDs is observed both during daytime and nighttime hours. No TID activity is seen between 0200 and 0800 hrs LT in any season. From the most probable periods of 10-30 min duration observed from the spectra it is inferred that the occurrence of medium scale TIDs is more probable at this low latitude station. The variation in the amplitudes of TIDs ranges from 0.2 to 3.75 TEC units in the entire data considered. The amplitudes show a linear relation with the periods of the waves, longer periods having larger amplitudes.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.21(1) [February 1992]|
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