INTRODUCTION
The neutral current sheet (NCS) of the interplanetary magnetic field (IMF) has a specific corrugated structure as a relatively thin layer that separates opposite polarities of the Sun’s magnetic field [Svalgaard, 1972; Svalgaard, Wilcox, 1975]. NCS extends from the Sun to the heliopause boundaries, and its wave structure causes two- or four-sector IMF structure to form in the solar equatorial region [Hoeksema, Wilcox, Scherrer, 1983]. Thus, Earth when rotating around the Sun periodically experiences transitions between positive and negative IMF sectors.
Earlier [Krymsky et al., 2012], we have examined the behavior of angular CR distribution when Earth crosses NCS, but as information on CR flux we used then only data from the neutron monitor station Moscow for January 1978 – January 2009. In the current study, the investigations are continued and expanded. We employ data from 32 stations of the worldwide network of neutron monitors and IMF and solar wind (SW) parameters from the OmniWeb database [http://omniweb.gsfc. nasa.gov/form/dx1.html]. The neutron monitor data are processed using the global survey method [Altukhov, Krymsky, Kuzmin, 1970]. We have thus obtained the components of the first two spherical harmonics of angular CR-distribution such as isotropic intensity, vector and tensor anisotropies.
