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ALMA as a Prominence Thermometer: First Observations
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SYSNO ASEP 0556099 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title ALMA as a Prominence Thermometer: First Observations Author(s) Heinzel, Petr (ASU-R) RID, ORCID
Berlicki, Arkadiusz (ASU-R) RID
Bárta, Miroslav (ASU-R) RID, ORCID
Rudawy, P. (PL)
Gunár, Stanislav (ASU-R) RID, ORCID
Labrosse, N. (GB)
Radziszewski, K. (PL)Number of authors 7 Article number L29 Source Title Astrophysical Journal Letters. - : Institute of Physics Publishing - ISSN 2041-8205
Roč. 927, č. 2 (2022)Number of pages 7 s. Publication form Online - E Language eng - English Country US - United States Keywords ALMA ; solar prominences ; solar and stellar astrophysics Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GA19-16890S GA ČR - Czech Science Foundation (CSF) GA19-17102S GA ČR - Czech Science Foundation (CSF) GC20-09922J GA ČR - Czech Science Foundation (CSF) LM2018106 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support ASU-R - RVO:67985815 UT WOS 000768516500001 EID SCOPUS 85126902245 DOI 10.3847/2041-8213/ac588f Annotation We present first prominence observations obtained with Atacama Large Millimeter Array (ALMA) in Band 3 at the wavelength of 3 mm. High-resolution observations have been coaligned with the MSDP H alpha data from Wroclaw-Bialkow large coronagraph at similar spatial resolution. We analyze one particular cotemporal snapshot, first calibrating both ALMA and MSDP data and then demonstrating a reasonable correlation between both. In particular, we can see quite similar fine-structure patterns in both ALMA brightness-temperature maps and MSDP maps of H alpha intensities. Using ALMA, we intend to derive the prominence kinetic temperatures. However, having current observations only in one band, we use an independent diagnostic constraint, which is the H alpha line integrated intensity. We develop an inversion code and show that it can provide realistic temperatures for brighter parts of the prominence where one gets a unique solution, while within faint structures, such inversion is ill conditioned. In brighter parts, ALMA serves as a prominence thermometer, provided that the optical thickness in Band 3 is large enough. In order to find a relation between brightness and kinetic temperatures for a given observed H alpha intensity, we constructed an extended grid of non-LTE prominence models covering a broad range of prominence parameters. We also show the effect of the plane-of-sky filling factor on our results. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2023 Electronic address http://hdl.handle.net/11104/0330924
Number of the records: 1