The Flare Emission of the May 4, 2022 Event
and Its Millimeter Component

V. V. Smirnova; Смирнова В. В.; Yu. T. Tsap; Цап Ю. Т.; V. S. Ryzhov; Рыжов В. С.; G. G. Motorina; Моторина Г. Г.; A. S. Morgachev; Моргачев А. С.; M. Bárta; Барта М.

doi:10.31857/S001679402360028X

The Flare Emission of the May 4, 2022 Event and Its Millimeter Component

Authors: Smirnova V.V.¹, Tsap Y.T.¹, Ryzhov V.S.², Motorina G.G.³^,4^,5, Morgachev A.S.⁵, Bárta M.³
Affiliations:
1. Crimean Astrophysical Observatory, Russian Academy of Sciences
2. Bauman Moscow State Technological University
3. Astronomical Institute of the Czech Academy of Sciences
4. Ioffe Institute
5. Central Astronomical Observatory at Pulkovo of Russian Academy of Sciences
Issue: Vol 63, No 5 (2023)
Pages: 561-569
Section: Articles
URL: https://ruspoj.com/0016-7940/article/view/650982
DOI: https://doi.org/10.31857/S001679402360028X
EDN: https://elibrary.ru/ZVMSYI
ID: 650982

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Abstract
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Abstract

Based on observations at the RT-7.5 radio telescope of the Bauman Moscow State Technical University
at a wavelength of 3.2 mm (93 GHz), along with other ground-based and space instruments (Siberian
radioheliograph, Solar Dynamics Observatory (SDO), Metsähovi radio observatory), the origin of millimeter
radiation from a solar flare was investigated for the SOL2022-05-04T08:45 X-ray class M 5.7 flare. An
analysis of the time profiles of radiation in the X-ray and centimeter ranges showed that the millimeter emission
source is not associated with hot (5 × 105–107 K) coronal plasma. This is also evidenced by the estimate
of the sub-THz flux of radiating hot plasma according to the AIA/SDO data, which turned out to be much
less than the observed values. Indications were obtained of the development of thermal instability in flare
ultraviolet loops. The relationship between the millimeter emission of the flare and the heat source in the
solar chromosphere has been substantiated.

References

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