Observed and Expected Features of the 27-day Variations of Galactic Cosmic Rays

Details Observed and Expected Features of the 27-day Variations of Galactic Cosmic Rays Observed and Expected Features of the 27-day Variations of Galactic Cosmic Rays

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4087a&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

The 27-day variations of galactic cosmic rays (GCR) during the period of 1976-2001 have been studied. A significant differences have been found between the amplitudes of the 27-day variations of GCR obtained by the non corrected for Forbush decreases (Fds) data and the corrected for Fds data, e.g. the well known Gnevyshev's gap is not so single valued seen based on the data corrected for Fds, and the maximum of recurrent variations is observed after the end of global solar magnetic field inversion. It is supposed that one of the general roles of the differences of the amplitudes of the 27day variation of GCR in different qA>0 and qA<0 solar magnetic cycles must be belonged to the heliolongitidunal asymmetry of the solar wind velocity.

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