Abstract
We study the 27-day variations of the galac- tic cosmic ray (GCR) intensity and three dimensional (3-D) anisotropy in different polarity periods of the solar magnetic cycle. We found that the larger amplitudes of the 27-day vari- ations of the galactic cosmic ray anisotropy and intensity in the minimum epochs of solar activity for the A> 0 polarity period than for the A 0 polarity period. The 27-day variation of the GCR 3-D anisotropy has a sporadic character; it appears and disappears as wave packages (wave oscillations) with an average duration of 4-6 solar rotations. We found that the rigidity R power law spectrum of the am- plitudes (A27) of the 27-day variation of the GCR intensity (A27/R ) is hard ( = 0.54± 0.11) in the A> 0 polar- ity period (1996-1997) and is soft ( = 0.95± 0.12) in the A< 0 period (1986-1987).
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