The Origin of Time Delays between Sub-Terahertz and Soft X-ray Emission from Solar Flares

Smirnova, V.V.; Tsap, Yu. T.; Morgachev, A. S.; Motorina, Galina; Bárta, Miroslav

doi:https://dx.doi.org/10.1134/S0016793221070173

Number of the records: 1

The Origin of Time Delays between Sub-Terahertz and Soft X-ray Emission from Solar Flares

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SYSNO ASEP	0552406
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	The Origin of Time Delays between Sub-Terahertz and Soft X-ray Emission from Solar Flares
Author(s)	Smirnova, V.V. (RU) Tsap, Yu. T. (RU) Morgachev, A. S. (RU) Motorina, Galina (ASU-R)_ORCID Bárta, Miroslav (ASU-R)_{RID, ORCID}
Source Title	Geomagnetism and Aeronomy. - : MAIK Nauka - Interperiodica - ISSN 0016-7932 Roč. 61, č. 7 (2021), s. 993-1000
Number of pages	8 s.
Publication form	Online - E
Language	eng - English
Country	RU - Russian Federation
Keywords	solar flares ; positive spectrum slope ; cross-correlation analysis
Subject RIV	BN - Astronomy, Celestial Mechanics, Astrophysics
OECD category	Astronomy (including astrophysics,space science)
R&D Projects	GC21-16508J GA ČR - Czech Science Foundation (CSF)
Method of publishing	Limited access
Institutional support	ASU-R - RVO:67985815
UT WOS	000736717300013
EID SCOPUS	85122083098
DOI	10.1134/S0016793221070173
Annotation	The time delays between sub-terahertz (sub-THz) and soft X-ray (SXR) emission from solar flares with a positive spectrum slope at frequencies of >100 GHz are considered. Based on a cross-correlation analysis of the time profiles of sub-THz and SXR emission from 11 flare events obtained from the KOSMA (230 GHz), SST (212 GHz), and RT-7.5 (93 GHz) telescopes, as well as the GOES satellite in channel 1-8 A, we identified two main types of sub-THz events. Type I includes four X-class events with a well-defined Neupert effect, i.e., the sub-THz flux outpaces the SXR flux by 2-9 min. Type II includes seven M-class flares, in which the time profiles behave similarly and the delays do not exceed 30 s. The different mechanisms of radio emission in different layers of the solar atmosphere may be responsible for the positive slope of the sub-THz spectrum of flares.
Workplace	Astronomical Institute
Contact	Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
Year of Publishing	2022
Electronic address	https://doi.org/10.1134/S0016793221070173

Number of the records: 1