Thermal instability in the impulsive phase of solar flares with sub-THz component

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00616900" target="_blank" >RIV/67985815:_____/24:00616900 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1017/S1743921323005185" target="_blank" >http://dx.doi.org/10.1017/S1743921323005185</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1017/S1743921323005185" target="_blank" >10.1017/S1743921323005185</a>

Result language
angličtina
Original language name
Thermal instability in the impulsive phase of solar flares with sub-THz component
Original language description
Coronal rain is formed in the post-impulsive phase of solar flares due to the thermal instability of coronal plasma in EUV loops. As a result, the sub-terahertz (sub-THz) emission flux in the post-impulsive phase of solar flares can be increased due to the increasing of the optical thickness of the thermal source. This suggests that sub-THz observations can be used as a diagnostic tool for coronal rain. This work is aimed to analyse the relationship between the sub-THz radiation and variations of the temperature and the emission measure of the EUV coronal plasma during the post-impulsive phase of the SOL2022-05-04T08:45 solar flare. Based on the two-dimensional temperature and emission measure distributions obtained from the AIA/SDO EUV intensity data, it was found that the temperature decreases whereas the emission measure reaches the maximum near the sub-THz flare peak. This circumstance and peculiarities of the radiation time profiles in different wave ranges show evidence in favor of the significant contribution of the thermal coronal loop plasma to the flare sub-THz radiation at least for some flare events. The sub-THz emission may be associated with a coronal condensation, accompanied by the formation of coronal rain.
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Proceedings of the International Astronomical Union
ISBN
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ISSN
1743-9213
e-ISSN
1743-9221
Number of pages
6
Pages from-to
414-419
Publisher name
Cambridge University Press
Place of publication
Cambridge
Event location
Jerevan
Event date
Aug 21, 2023
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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