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The bremsstrahlung emitted from thermal plasmas which coexist with a flux of energetic (suprathermal) electrons is calculated. It is found that under some circumstances the radiation emitted can be greatly increased compared to the emission from a Maxwellian plasma with no energetic particles present. The enhanced emission occurs at the fundamental and second harmonic of the electron plasma frequency.
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Tidman et al. (1965) studied this question.
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