A plasma which is immersed in superthermal radiation suffers velocity-space diffusion which is enhanced by the photon-induced Coulomb-field fluctuations. This enhanced diffusion universally produces a power-law distribution (EE₀)^-κ at energy E larger than a critical energy E₀ where the transition energy E₀ and the power κ are inversely proportional to the photon-field intensity.
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Hasegawa et al. (1985) studied this question.
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