Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3205m&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
Using solar proton events (SPE) identified in ice cores, and from satellite and other data, it is shown that the frequency of occurrence of large SPEs has varied by a factor >10 in the interval 1561-1994. There is a well defined "Gleissberg" ( 80-85 year) periodicity in the data, with six well defined minima, two in close association with the Maunder and Dalton minima in sunspot numbers. The present "satellite" era is a recurrence of this series of minima. It is shown that the rate of occurrence of SPE during Schwabe cycle 1698-1711, at the end of the Maunder Minimum, was one of the highest in the period 1561-1994. This and auroral data indicate that the sun recommenced the acceleration of cosmic rays 15 years prior to the onset of significant geomagnetic activity. It is proposed that major changes in the solar corona at the end of the Maunder Minimum, and during the Gleissberg cycle, modulated the efficiency of the cosmic ray acceleration processes near the sun.
Dreschhoff Gisela A. M.
McCracken K. G.
Shea Margaret Ann
Smart Don Frederick
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