Original title: Identification of features in solar ALMA images and comparison with solar atmospheric models
Authors: Skokić, Ivica ; Brajša, R. ; Sudar, D. ; Kuhar, M. ; Benz, A. O.
Document type: Papers
Conference/Event: Solar Influences on the Magnetosphere, Ionosphere and Atmosphere /9./, Sunny Beach (BG), 20170530
Year: 2017
Language: eng
Abstract: Various solar features were identified in the full-disc single-dish ALMA images taken at wavelength of 1.2 and 2.8 mm and compared with H.alpha., Ca II K and EUV images and magnetograms. Assuming thermal bremsstrahlung as the dominant radiation mechanism, several models were constructed to calculate the brightness temperature of various solar features (quiet and active solar regions, filaments and coronal holes) in a wavelength range from 0.3 to 10 mm. It is found that model predictions are in a qualitative agreement with ALMA images where active regions appear brighter, while filaments and coronal holes are not discernible from the quiet Sun level. It is also found that in ALMA images regions around magnetic neutral lines appear darker than the quiet Sun. Models predict a critical frequency below which filaments should appear in absorption and above it in emission.
Keywords: ALMA; images regions; magnetic neutral lines
Project no.: 312495, LM2015067 (CEP), 7E13003 (CEP)
Funding provider: GA MŠk, GA MŠk
Host item entry: Book of Proceedings: Ninth Workshop Solar Influences on the Magnetosphere, Ionosphere and Atmosphere, ISSN 2367-7570

Institution: Astronomical Institute AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: http://ws-sozopol.stil.bas.bg/2017Sunny/Proceedings2017_V3.pdf
Original record: http://hdl.handle.net/11104/0280563

Permalink: http://www.nusl.cz/ntk/nusl-373450


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