Current density and diffusion coefficient for cosmic ray particles

The expression of current density for cosmic ray particles scattering in the interplanetary turbulent magnetic fields is found and it is shown that the convectional component of the velocity of the current particles does not correspond to solar wind velocity, but it is determined by the 'drifting' velocity of the charged particles in the solar wind. A tensor diffusion coefficient is calculated in the case of R<<Lsub(c), where R is the Larmor radius. The longitudinal spatial diffusion coefficient and the mean free path are discussed in detail. (author)