Abstract
Recent progress in the description of electron beam propagation in a plasma allows us to obtain explicit expressions for Langmuir turbulence generated by the beam. Radio emission of an electron beam accompanied by Langmuir turbulence (beam-plasma structure – BPS), propagating in the solar corona is considered within the plasma emission mechanism. The maximum brightness temperatures of a BPS radio emission with velocity v BPS≈0.35 c at fundamental and harmonic frequencies are found to be equal to T F=1013 K, T H=1016 K, respectively. It is shown that the temperature of radio emission sharply declines with the decrease of BPS velocity. The dominant drift velocity of Type III sources (≈0.3 c) and broad range of observable brightness temperatures are naturally explained by the latter fact.
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