Fine Structures of Type-IV Solar Radio Bursts Associated
with Stationary and Moving Sources

V. V. Fomichev; Фомичев В. В.; G. P. Chernov; Чернов Г. П.

doi:10.31857/S0016794022600466

Fine Structures of Type-IV Solar Radio Bursts Associated with Stationary and Moving Sources

Authors: Fomichev V.V.¹, Chernov G.P.¹
Affiliations:
1. Pushkov Institute of Terrestrial Magnetism, the Ionosphere, and Radio Wave Propagation (IZMIRAN), Russian Academy of Sciences
Issue: Vol 63, No 2 (2023)
Pages: 181-189
Section: Articles
URL: https://ruspoj.com/0016-7940/article/view/651025
DOI: https://doi.org/10.31857/S0016794022600466
EDN: https://elibrary.ru/DLPHJG
ID: 651025

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Abstract
About the authors
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Abstract

Various types of fine structure in the continuum emission of type-IV radio bursts are considered as
applied to different types of radiation sources, both stationary and moving. In the case of stationary sources,
the origin of the fine structure is associated both with processes in individual magnetic loops (quasi-periodic
acceleration and magnetohydrodynamic waves), and with large-scale processes associated with the propagation
of magnetohydrodynamic disturbances, the formation of loop arcades, and processes of discrete acceleration
of particles synchronous with them, causing the pulsating nature of radio emissions. For the case of a
moving source, the generation mechanism largely depends on the magnetic structure of the source (an
expanding magnetic arc or an isolated plasma cloud). In this case, the connection with coronal mass ejections
and shock waves is also important. Secondary pulsations are explained by a magnetohydrodynamic fluctuation
source in the form of a magnetic loop or cloud. The absence of other fine structures in the continuum of
moving type-IV bursts may be due to the critical angle of the loss cone for the excitation of whistlers

About the authors

V. V. Fomichev

Pushkov Institute of Terrestrial Magnetism, the Ionosphere, and Radio Wave Propagation (IZMIRAN), Russian Academy of Sciences

Email: gchernov@izmiran.ru
Moscow, Troitsk, 108840 Russia

G. P. Chernov

Pushkov Institute of Terrestrial Magnetism, the Ionosphere, and Radio Wave Propagation (IZMIRAN), Russian Academy of Sciences

Author for correspondence.
Email: fomichev@izmiran.ru
Moscow, Troitsk, 108840 Russia

References

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