Physics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002acppb..33.1149a&link_type=abstract
Acta Physica Polonica B, vol. 33, Issue 4, p.1149
Physics
16
Scientific paper
The generalized anisotropic diffusion tensor, streams and drift velocities of Galactic Cosmic Rays (GCR) for the three dimensional Interplanetary Magnetic Field (IMF) have been analysed. Stochastic and regular changes of GCR, especially 11-year and 27-day variations have been studied. It is stressed that in seventies the generalized anisotropic diffusion tensor has been rarely used due to lack of the direct evidence of the latitudinal component of the IMF. However, now this tensor must be largely used as far as the experimental data and theoretical investigations show the existence of the latitudinal component of the IMF, i.e. heliospheric magnetic field is three-dimensional. The nature of the 11-year variation of GCR is critically considered. It is concluded that the general mechanism of the 11-year variation of GCR must be the change of the structure of the stochastic IMF. Particularly the effective size of the irregularities of the IMF responsible for the diffusion of GCR increases in the minima epochs of solar activity with respect to the maxima epochs. Thus, the different character of the diffusion of GCR in different epochs of solar activity is the general mechanism of 11-year variation of GCR. The temporal changes of the energy spectrum of the 11-year variations of GCR versus the solar activity, namely soft energy spectrum in the maxima epochs and hard one in the minima epochs, conform this conclusion. The modelling and experimental investigations show that the amplitude of the 27-day variations of GCR is greater about 1.5 times in the period of the qA{>}0 solar magnetic cycle than in the period of the solar magnetic cycle qA{<}0, which is not yet well explained according to the modern theory of GCR modulation.
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