Radioheliograph observations of microwave bursts with zebra structures

Details Radioheliograph observations of microwave bursts with zebra structures Radioheliograph observations of microwave bursts with zebra structures

2011-09-27

arxiv.org/abs/1109.5758v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

18 pages, 7 figures

Scientific paper

10.1007/s11207-011-9856-9

The so-called zebra structures in radio dynamic spectra, specifically their frequencies and frequency drifts of emission stripes, contain information on the plasma parameters in the coronal part of flare loops. This paper presents observations of zebra structures in a microwave range. Dynamic spectra were recorded by Chinese spectro-polarimeters in the frequency band close to the working frequencies of the Siberian Solar Radio Telescope. The emission sources are localized in the flare regions, and we are able to estimate the plasma parameters in the generation sites using X-ray data. The interpretation of the zebra structures in terms of the existing theories is discussed. The conclusion has been arrived that the preferred generation mechanism of zebra structures in the microwave range is the conversion of plasma waves to electromagnetic emission on the double plasma resonance surfaces distributed across a flare loop.

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