A Five Year Periodicity in the Galactic Cosmic Radiation at Times of a Mildly Active Sun

Details A Five Year Periodicity in the Galactic Cosmic Radiation at Times of a Mildly Active Sun A Five Year Periodicity in the Galactic Cosmic Radiation at Times of a Mildly Active Sun

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh52b..12m&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH52B-12

Physics

7536 Solar Activity Cycle (2162), 2104 Cosmic Rays, 2162 Solar Cycle Variations (7536)

Scientific paper

Using cosmogenic 10Be data for the period 1700-1950 AD, we identify a previously unrecognised cosmic ray modulation process that occurs during epochs of low solar activity. In this, the galactic cosmic radiation exhibits a maximum near sunspot maximum, as well as the well known maxima coincident with sunspot minimum. This result explains the 5 year and 16 year periodicities previously identified in power spectral analyses of 10Be and 14C data, and allows their physical significance to be studied. We speculate that the increased cosmic ray intensity at sunspot maximum is associated with the reversal of the solar magnetic field, and discuss two possible mechanisms.

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