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

0552406 - ASÚ 2022 RIV RU eng J - Článek v odborném periodiku
Smirnova, V.V. - Tsap, Yu. T. - Morgachev, A. S. - Motorina, Galina - Bárta, Miroslav
The Origin of Time Delays between Sub-Terahertz and Soft X-ray Emission from Solar Flares.
Geomagnetism and Aeronomy. Roč. 61, č. 7 (2021), s. 993-1000. ISSN 0016-7932. E-ISSN 1555-645X
Grant CEP: GA ČR(CZ) GC21-16508J
Institucionální podpora: RVO:67985815
Klíčová slova: solar flares * positive spectrum slope * cross-correlation analysis
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 0.844, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1134/S0016793221070173

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.
Trvalý link: http://hdl.handle.net/11104/0327542