Naslov
Identification of features in solar ALMA images and comparison with solar atmospheric models

Autori
Skokić, Ivica ; Brajša, Roman ; Sudar, Davor ; Kuhar, Matej ; Benz, Arnold O.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Ninth Workshop "Solar Influences on the Magnetosphere, Ionosphere and Atmosphere" Book of Proceedings / Georgieva, Katya ; Kirov, Boian ; Danov, Dimitar - Sunny Beach : Space Research and Technologies Institute, 2017, 121-126

Skup
Ninth Workshop "Solar Influences on the Magnetosphere, Ionosphere and Atmosphere"

Mjesto i datum
Sunčana obala, Bugarska, 30.05.2017. - 03.06.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ALMA ; Sun

Sažetak
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 Hα, 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA