Long-term Modulation of Cosmic Ray Intensity in relation to Sunspot Numbers and Tilt Angle

Details Long-term Modulation of Cosmic Ray Intensity in relation to Sunspot Numbers and Tilt Angle Long-term Modulation of Cosmic Ray Intensity in relation to Sunspot Numbers and Tilt Angle

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006japa...27..455g&link_type=abstract

Journal of Astrophysics and Astronomy, vol. 27, no.4, P. 455-464.

Astronomy and Astrophysics

Astrophysics

2

Cosmic Ray Intensity, Sunspot Numbers, Tilt Angle

Scientific paper

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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