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Title: An investigation of Forbush decrease event and geomagnetic disturbances
Authors: Kaushik, Subhash C
Shrivastava, Pankaj K
Issue Date: Feb-2000
Publisher: NISCAIR-CSIR, India
Abstract: A large Forbush decrease event which occurred during the period of solar magnetic polarity reversal in solar cycle 22, was observed from 8 to 20 April 1990. The onset of the Forbush decrease took place on 8-9 April 1990 and attained its maximum on 9 April 1990. After that the long recovery phase started, which continued up to 20 April 1990. Three successive events of sudden storm commencements (SSCs) occurred on 9, 12 and 17 April 1990, which covered total time span of Forbush decrease events. The geomagnetic index AE has also been observed to increase abruptly on 9 April 1990. An attempt has been made to explain the cosmic ray decrease alongwith the interplanetary/geomagnetic disturbances that occurred when there was a solar magnetic polarity reversal and thus ascertained their peculiarities.
Page(s): 47-49
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.29(1) [February 2000]

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