Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3678a&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
The temporal changes of the amplitude of the 27-day variation of galactic cosmic rays (GCR) has been compared with the changes of the longitudinal asymmetry of the sunspot area distribution over the Sun's disc, with the tilt angle of the heliospheric current sheet (HCS) and with the polar coronal hole area for three magnetic cycles of the Sun (1970-2000). A good correspondence of the amplitude of the 27-day cosmic ray variation with the longitudinal asymmetry and the tilt angle is observed when qA<0, whereas at qA>0 the change of the amplitude of the 27-day cosmic ray variation follows to the polar coronal hole area. To study an influence of the heliolatitudinal asymmetry of the heliosphere and the radial decay of the heliolongitudinal asymmetry of solar wind velocity and diffusion coefficient on the 27-day variation of GCR 3dimentional Parker's transport equation with drift has been numerically solved for different solar magnetic cycles, qA>0 and qA<0.
Alania Michael V.
Baranov D. G.
Gil Agnesha
Tyasto M. I.
Vernova E. S.
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