Type III solar radioburst profiles and the associated electron energy spectra

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Models, Electron Energy, Energy Spectra, Solar Electrons, Type 3 Bursts, Decay Rates, Landau Damping, Plasma Waves, Solar Wind

Scientific paper

An attempt is made to explain the observed frequency-time profiles of type III solar radio bursts in terms of a rapid plasma-wave decay rate combined with the exciter model recently proposed by Harvey (1975). The decay rate is assumed to be sufficiently rapid for the plasma-wave energy-density profile to be similar to the exciter power-density time profile; this is consistent with the exciter model, where the rapid decay is caused by Landau damping of the electrons in the modified high-energy tail of the ambient plasma electron-velocity distribution. The model is compared with radio observations by making simple assumptions about the dependence of the radio intensity on the plasma wave energy. A comparison is made with simultaneous radio and electron observations by further assuming a simple power-law velocity distribution for the electrons at their point of ejection from the sun.

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