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Solar plasma radio emission in the presence of imbalanced turbulence of kinetic-scale Alfvén waves  

Olena Lyubchyk   Submitted: 2017-07-13 09:00

We study the influence of kinetic-scale Alfvénic turbulence on the generation of plasma radio emission in the solar coronal regions where the plasma/magnetic pressure ratio β is smaller than the electron/ion mass ratio me/mi. The present study is motivated by the phenomenon of solar type I radio storms associated with the strong magnetic field of active regions. The measured brightness temperature of the type I storms can be up to 1010 K for continuum emission, and can exceed 1011 K for type I bursts. At present, there is no generally accepted theory explaining such high brightness temperatures and some other properties of the type I storms. We propose the model with the imbalanced turbulence of kinetic-scale Alfvén waves producing an asymmetric quasilinear plateau on the upward half of the electron velocity distribution. The Landau damping of resonant Langmuir waves is suppressed and their amplitudes grow spontaneously above the thermal level. The estimated saturation level of Langmuir waves is high enough to generate observed type I radio emission at the fundamental plasma frequency. Harmonic emission does not appear in our model because the backward-propagating Langmuir waves undergo a strong Landau damping. Our model predicts 100% polarization in the sense of the ordinary (o-) mode of type I emission.

Authors: O. Lyubchyk, E.P. Kontar, Y.M. Voitenko, N.H. Bian, D.B. Melrose
Projects: None

Publication Status: accepted for publication in Solar Physics
Last Modified: 2017-07-14 08:39
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Solar plasma radio emission in the presence of imbalanced turbulence of kinetic-scale Alfven waves

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