Solar activity dependence of the cosmic ray 27-day variation

Details Solar activity dependence of the cosmic ray 27-day variation Solar activity dependence of the cosmic ray 27-day variation

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3856s&link_type=abstract

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

Physics

Scientific paper

We use neutron monitor data and muon telescope data, during the last four solar cycles to examine the solar activity dependence of the 27-day variation of galactic cosmic rays. These detectors cover the median primary rigidity range 16-60 GV. The amplitude of the 27-day variation is rigidity dependent. It is linearly correlated with the level of solar activity. It shows obvious solar activity cycle as well as magnetic cycle variations. The 27-day variation of cosmic rays is also negatively correlated with the solar activity, with lag of 5 years. It is linearly correlated± with the geomagnetic activity as well.

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