Long-term modulation of cosmic ray intensity in relation to sunspot numbers and tilt angle |
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| Authors: | Meera Gupta V K Mishra A P Mishra |
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| Institution: | (1) Department of Physics, A. P. S. University, 486 003 Rewa (M. P.), India |
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| Abstract: | A detailed correlative analysis between sunspot numbers (SSN) and tilt angle (TA) with cosmic ray intensity (CRI) in the neutron
monitor energy range has been performed for the solar cycles 21, 22 and 23. It is found that solar activity parameters (SSN
and TA) are highly (positive) correlated with each other and have inverse correlation with cosmic ray intensity (CRI). The
‘running cross correlation coefficient’ between cosmic ray intensity and tilt angle has also been calculated and it is found
that the correlation is positive during the maxima of odd cycles 21 and 23. Moreover, the time lag analysis between CRI and
SSN, and between CRI and TA has also been performed and is supported by hysteresis curves, which are wide for odd cycles and
narrow for even cycles. |
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| Keywords: | Cosmic ray intensity sunspot numbers tilt angle |
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