A Scenario for the Fine Structures of Solar Type IIIb Radio Bursts Based on the Electron Cyclotron Maser Emission
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In this paper, a scenario based on the electron cyclotron maser emission is proposed for the fine structures of solar radio emission in the present discussion, which is suggested that under certain conditions modulation of the ratio between the plasma frequency and electron gyro-frequency by ultra low frequency waves may lead to the intermittent emission of radio waves.Abstract:
A scenario based on the electron cyclotron maser emission is proposed for the fine structures of solar radio emission in the present discussion. It is suggested that under certain conditions modulation of the ratio between the plasma frequency and electron gyro-frequency by ultra low frequency waves, which is a key parameter for excitation of the electron cyclotron maser instability, may lead to the intermittent emission of radio waves. As an example, the explanation of the observed fine-structure components in the solar type IIIb burst is discussed in detail. Three primary issues of the type IIIb bursts are addressed: 1) what is the physical mechanism that results in the intermittent emission elements that form a chain in the dynamic spectrum of type IIIb bursts, 2) what causes the split pair (or double stria) and the triple stria, 3) why in the events of fundamental-harmonic pair emission there is only IIIb-III, but IIIb-IIIb or III-IIIb cases are very rarely observed.read more
Citations
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Imaging spectroscopy of solar radio burst fine structures.
Eduard P. Kontar,Sijie Yu,Alexey A. Kuznetsov,A. G. Emslie,B. Alcock,Natasha L. S. Jeffrey,Valentin Melnik,Nicolas Bian,Prasad Subramanian +8 more
TL;DR: Radio observations of the solar atmosphere provide a unique view on the non-thermal processes in the outer atmosphere and the authors use LOFAR observations to demonstrate that the observed radio burst characteristics are dominated by propagation effects rather than underlying emission variations.
Journal ArticleDOI
Imaging Spectroscopy of Solar Radio Burst Fine Structures
Eduard P. Kontar,Sijie Yu,Alexey A. Kuznetsov,A. G. Emslie,B. Alcock,Natasha L. S. Jeffrey,Valentin Melnik,Nicolas Bian,Prasad Subramanian +8 more
TL;DR: In this article, the spatial and frequency characterization of solar radio burst fine structures observed with the LOw Frequency Array (LOFAR) is presented, and it is shown that radio-wave propagation effects, and not the properties of the intrinsic emission source, dominate the observed spatial characteristics of radio burst images.
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A type III radio burst automatic analysis system and statistic results for a half solar-cycle with the Nan\c{c}ay Decameter Array data
TL;DR: In this paper, an event recognition-analysis system that can automatically detect solar type III radio burst and mine information of the burst from the dynamic spectra observed by Nancay Decameter Array (NDA).
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A type III radio burst automatic analysis system and statistic results for a half solar cycle with Nançay Decameter Array data
TL;DR: In this paper, an event recognition-analysis system that can automatically detect solar type III radio burst and mine information of the burst from the dynamic spectra observed by Nancay Decameter Array (NDA).
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Conditions for electron-cyclotron maser emission in the solar corona
TL;DR: In this article, the conditions for electron-cyclotron maser (ECM) emission in the solar corona were investigated by considering the ratio of the electron plasma frequency ω p to the electron cyclotron frequency Ωe.
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