Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acppb..39.1301g&link_type=abstract
Acta Physica Polonica B, vol. 39, Issue 5, p.1301
Physics
2
Scientific paper
We study features of the 27-day variations of the galactic cosmic ray (GCR) intensity and anisotropy using data of neutron monitors and solar wind (SW) velocity. We found that the larger amplitudes of the 27-day variations of the galactic cosmic ray anisotropy and intensity for the positive polarity period (Age 0) of solar magnetic cycle than for the negative polarity period (Ale 0) in the minima epoch of solar activity are related with the heliolongitudinal asymmetry of the solar wind velocity. We reveal the long-lived (sim 22 years) active regions of the heliolongitudes being the sources of the 27-day variation of the solar wind velocity during the Age 0 period. Also, we demonstrate an existence of the clear stable 27-day waves of the GCR intensity and anisotropy with the amplitudes larger in the Age 0 than in the Ale 0 for the several individual Carrington rotations in the minima epoch of solar activity. We show that the solution of the Parker's transport equation with the heliolongitudinal asymmetry of the solar wind velocity is in the reasonable agreement with the neutron monitors experimental data. We conclude that the larger amplitudes of the 27-day variations of the galactic cosmic ray anisotropy and intensity observed by the experimental data in the Age 0 are related with the superposition of two effects: (1) the existence of the more regular heliolongitudinal asymmetry of the solar wind velocity, and (2) a coincidence of convective and drift streams of the GCR particles in comparison with the Ale 0.
Alania Michael V.
Gil Agnesha
Modzelewska Renata
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