The emission mechanisms for solar radio bursts

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electrostatic Waves, Mathematical Models, Plasma Radiation, Solar Radio Bursts, Wave Scattering, Astronomy, Cyclotron Resonance, Harmonic Radiation, Nonuniform Plasmas, Plasma Density, Sawtooth Waveforms, Synchrotron Radiation, Temperature Effects, Thomson Scattering, Transverse Waves, Wave Amplification

Scientific paper

Possible mechanisms for nonthermal meter-wave solar radio bursts are reviewed, with particular emphasis on the standard fundamental plasma emission model. The standard version of fundamental plasma emission as arising from the scattering of Langmuir waves into transverse waves by thermal ions is treated semi-quantitatively by analogy with Thomson scattering, and the transfer equation is derived from a physical interpretation of induced scattering. Alternative mechanisms for fundamental plasma emission, namely the coalescence of Langmuir waves with low-frequency waves and direct conversion due to a density inhomogeneity are then discussed. Attention is also given to the characteristics and possible mechanisms for second harmonic plasma emission and to analytic treatments of gyro-synchrotron emission.

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