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Title: Some Studies on vIf Atmospherics over Calcutta
Authors: Sarkar, S K
Bhattacharya, A B
Issue Date: Oct-1978
Publisher: NISCAIR-CSIR, India
Abstract: Characteristics of integrated field intensity of atmospherics (IFIA) recorded over Calcutta in the vlf band have been analyzed in relation to (i) local thunderstorms and (ii) monsoon clouds. In the course of a thunderstorm the records of IFIA always exhibit an initial gradual rise followed by a sudden enhancement. Usually single sudden enhancement is predominant during the monsoon and post-monsoon thunderstorms while double sudden enhancement has been found mostly for the premonsoon cases. A steady recovery of atmospherics starts in all the cases after these enhancements. The results show that during the monsoon and post-monsoon thunderstorms the precipitation is associated with the steady recovery of IFIA while that during the pre-monsoon thunderstorms is associated with the second sudden enhancement. Sudden decreases of atmospherics (SDAs) have been found to be associated with the nimbostratus clouds in the monsoon months. Multiple decreases have also been noted sometimes at an interval of about an hour. The occurrences and the magnitude of the SDA are found to be greater at 20 kHz than at 10 and 30 kHz. Practically no SDA effect was noted during the late noon hours of a day when the convective activity is known to be maximum.
Page(s): 242-247
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.07(5) [October 1978]

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