Název:
Identification of features in solar ALMA images and comparison with solar atmospheric models
Autoři:
Skokić, Ivica ; Brajša, R. ; Sudar, D. ; Kuhar, M. ; Benz, A. O. Typ dokumentu: Příspěvky z konference Konference/Akce: Solar Influences on the Magnetosphere, Ionosphere and Atmosphere /9./, Sunny Beach (BG), 20170530
Rok:
2017
Jazyk:
eng
Abstrakt: 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.
Klíčová slova:
ALMA; images regions; magnetic neutral lines Číslo projektu: 312495, LM2015067 (CEP), 7E13003 (CEP) Poskytovatel projektu: GA MŠk, GA MŠk Zdrojový dokument: Book of Proceedings: Ninth Workshop Solar Influences on the Magnetosphere, Ionosphere and Atmosphere, ISSN 2367-7570