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Title: Study of cosmic ray intensity variations in relation to solar activity for sunspot cycles 19 to 23
Authors: Gupta, Meera
Mishra, V K
Mishra, A P
Keywords: Cosmic ray
Solar cycles
Sunspot numbers
Solar flux
Grouped solar flares
Solar flare index
Coronal index
Issue Date: Jun-2006
Publisher: CSIR
Abstract: Based on the monthly data of various solar activity (SA) parameters, e.g. sunspot numbers (SSN), solar flux (SF), grouped solar flares (GSF), solar flare index (SFI) and coronal index (CI), a correlative study between solar activity (SA) and cosmic ray intensity (CRI, monthly mean of neutron monitor count rates) has been performed by the “running cross-correlation method”. Overall behaviour of the running cross-correlation function between CRI and different SA parameters is almost similar, except during the maxima of solar cycles. Moreover, the time-lag analysis has been performed by the method of “minimizing correlation coefficient” and it is found that observed time-lag between CRI and various SA parameters is similar, except the coronal index (CI). The time-lag is found to be larger for odd solar cycles (19, 21 and 23) in comparison to even solar cycles (20 and 22), showing odd-even asymmetry of solar cycles. The correlation between CRI and different SA parameters considering time-lag factor during the whole period of investigation has been presented. The differences observed in the time-lag between CRI and different SA parameters, especially for CI, have also been discussed.
Page(s): 167-173
ISSN: 0367-8393
Source:IJRSP Vol.35(3) [June 2006]

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