Galactic Cosmic Ray Modulations For Four Solar Activity Cycles

Details Galactic Cosmic Ray Modulations For Four Solar Activity Cycles Galactic Cosmic Ray Modulations For Four Solar Activity Cycles

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3780e&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

5

Scientific paper

The cosmic ray (CR) particles are affected by the electromagnetic disturbances while transporting from galactic space to the Earth. The data obtained with a variety of detectors on Earth and located at different global sites, are examined. We discuss the solar cycle 22 in comparison with previous cycles. Principle characteristics of CR variations as given by ground-based observations were examined. Very similar of CR intensity modulations observed at different neutron monitors. The solar activity cycle 22 is the second most active cycle. 1. Introduction It has been known that the cosmic ray intensities (CRIs) and their energy spectrum are modulated by solar activity cycle (SAC) from one to another. Usoskin et al (1998) performed a correlation study of sunspot numbers and CRI for the last four solar cycles. Their analysis of the running cross correlation between the monthly series showed that the two cycles 21 and 22 coincided with each other, at least to the time available of the study. The region of cosmic ray modulation has changed according to the solar cycle (even or odd cycle). The magnitudes of modulation region for cycles 21 and 22 are significantly larger than for cycles 19 and 20 (Dorman et al., 1999a; 1999b). Ahluwalia (1997a) showed that there did not appear to be any striking correspondence between the amplitudes and durations of solar activity cycles and observed cosmic ray modulation over six cycles. Also, he found a three SAC periodicity may be present in the CRI data and geomagnetic activity (Ap), expecting the amplitude of CR modulation for SAC 23 may be further smaller than for cycles 21 and 22. On the other hand, the spectra of long-term CR modulations displayed a clear dependence on the global solar magnetic field (GSMF) sign with harding spectra for qA<0 epochs.

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