Propagation and radio emission of electrons beams inthe solar corona

Eduard P. Kontar

V.N. Mel\'nik

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 vBPS~0.35 c at fundamental and harmonic frequencies are found to be equal to T_F=10^13 K, T_H=10^16 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.