Progress and problems in the theory of type III solar radio emission

Astronomy and Astrophysics – Astronomy

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Plasma Dynamics, Radio Astronomy, Type 3 Bursts, Electric Fields, Electron Distribution, Electrostatic Waves, Harmonic Generations, Ion Acoustic Waves, Polarization Characteristics, Spaceborne Astronomy

Scientific paper

The experimental and theoretical status of type III solar radio emission is considered in detail. The author emphasizes very recent developments which are relevant to the underlying plasma physics. In particular he discusses the identity of the sub-megahertz emissions as fundamental, or second harmonic, the degree of correlation between emissivities, electron streams, and plasma (Langmuir) waves, paradoxes concerned with the time-ordering of these phenomena, and the role of background density irregularities and ion-acoustic turbulence in the solar wind. From the theoretical point of view the current picture of the underlying Langmuir turbulence is discussed including such effects as the interaction between Langmuir waves and stream electrons, induced scatter off ions, and strong turbulence effects such as modulational instability and soliton collapse.

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