Flares detected in ALMA single-dish images of the Sun

0571483 - ASÚ 2024 RIV FR eng J - Journal Article
Skokić, I. - Benz, A. O. - Brajša, R. - Sudar, D. - Matkovic, F. - Bárta, Miroslav
Flares detected in ALMA single-dish images of the Sun.
Astronomy & Astrophysics. Roč. 669, January (2023), č. článku A156. ISSN 0004-6361. E-ISSN 1432-0746
EU Projects: European Commission(XE) 824135 - SOLARNET
Institutional support: RVO:67985815
Keywords : Sun * flares * chromosphere
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.5, year: 2022
Method of publishing: Open access

The millimeter and submillimeter radiation of solar flares is poorly understood. Without spatial resolution, millimeter emission cannot be easily compared to flare emission in other wavelengths. Though the Atacama Large Millimeter-submillimeter Array (ALMA) offers sufficient resolution for the first time, ALMA cannot be used on demand to observe when a flare occurs, and when used as an interferometer, its field of view is smaller than an active region. We used readily available large-scale single-dish ALMA observations of solar millimeter flares and compared them to well-known features observed in other wavelengths. The properties of these other flare emissions, correlating in space and time, could then be used to interpret the millimeter brightenings and vice versa. The aim is to obtain reliable associations limited by the time and space resolution of single-dish observations. Ordinary interferometric ALMA observations require single-dish images of the full Sun for calibration. We collected such observations at 3 mm and 1 mm and searched for millimeter brightenings during times listed in a flare catalog.
Permanent Link: https://hdl.handle.net/11104/0343107