Cosmic ray scattering in an anisotropic random small-scale magnetic field

The small-scale collision integral in an approximation of a weak regular magnetic field is transformed using unequal parallel and perpendicular correlation lengths of a relatively regular magnetic field. The collision frequency, the tensor of spatial diffusion, and the mean free path of CR particles are determined. It has been indicated that the mean free path of CR particles can increase several ten times in high-speed solar wind streams in a strongly anisotropic random magnetic field at small parallel correlation lengths.