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Solar Radio Bursts Associated with Standing Shock Waves

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Abstract

A number of phenomena with radio bursts in the decimeter and centimeter wavelength ranges similar to type-II bursts in the meter range have been considered. In all phenomena, the radio bursts are characterized by the cessation of frequency drift and its reversal. Analysis of all of the available data on relevant bursts provides evidence of termination shocks with particle accelerations in their fronts. This is confirmed by the generation of new sources of hard X-ray radiation and the radio emission of fast bursts (spikes), fibers, and zebra structures. The sources of drift stripes with a drift turn are located either between the burst loop and the lower shock wave or between the lower and upper shock waves. Estimates of the critical Mach number for common parameters of the burst plasma indicated that the values (Mcr = 1.1–1.3) can easily be observed in the given phenomena and that the radiation can be associated with the Buneman instability. The conditions necessary for the generation of observed electromagnetic radiation bursts can be provided in helmet-shaped magnetic structures in the solar corona.

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ACKNOWLEDGMENTS

The authors are grateful to the Chinese colleagues for kindly providing them with spectral data obtained at the Huairou National Observatory (China), as well as to M. Karlický for providing them with spectral data obtained at the Ondřejov Observatory. The authors are also grateful to the RHESSI, GOES, and LASCO teams for providing them with open access to relevant data.

Funding

This work was supported by the Russian Foundation for Basic Research, project no. 17-02-00308 and the Ministry of Science and Higher Education, project no. KP19-270.

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Authors and Affiliations

  1. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, Russian Academy of Sciences (IZMIRAN), Troitsk, Moscow, Russia

    V. V. Fomichev & G. P. Chernov

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  1. V. V. Fomichev
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  2. G. P. Chernov
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Correspondence to G. P. Chernov.

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Translated by V. Arutyunyan

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Fomichev, V.V., Chernov, G.P. Solar Radio Bursts Associated with Standing Shock Waves. Geomagn. Aeron. 60, 137–150 (2020). https://doi.org/10.1134/S001679322002005X

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