R

If we consider that in a galactic arm the regular component of plasma motion velocity is u = 0, then udr = 0, and JR = 0 . In this case dn dn dn dn dn

Jx = -Ko —, Jy = -Koa1 -y - Koa2 dz' Jz = Koa2 dy ~ Koa1~ . (2127)

dx dz

Substituting Eq. 2.12.7 in Eq. 2.12.1 we find the searched equation of anisotropic diffusion for the case under consideration:

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