where j = cos& (0 is a pitch-angle between a particle velocity v and the direction of a magnetic line of force); v is the absolute value of a particle velocity; z is a coordinate along of a line of force of the regular component of magnetic field; DJjU
is the diffusion coefficient in the pitch-angle space. In the case of the
scattering inhomogeneities being able to be represented in the form of solid spheres, we then have
where v is the collision frequency. The spatial field-aligned coefficient of diffusion Dzz is related to Dm by the expression v2 +11 -u2 )2 Dzz =— P n ' dp. (2.15.8)
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