Z y vy

where Io is the modified Bessel function. A quantity - (z) has the meaning of a mean square angle of a particle's scattering (Galperin et al., 1971).

If we can neglect the dependence of Ho and A// on z, then a mean square angle of a scattering increases proportionally to a distance from the source. If Ho and H1 vary at distance according to the same law

and the spectrum shape (the values lc and v) remains unchanged, then at z >> zo z o

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