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Analysis of full-disc H alpha observations: Carrington maps and filament properties in 1909-2022
Theodosios Chatzistergos, Ilaria Ermolli, Dipankar Banerjee +14
Full disc observations of the Sun in the H line provide information about the solar chromosphere and in particular about the filaments, which are dark and elongated features tha…
Spectral variability of photospheric radiation due to faculae II: Facular contrasts for cool main-sequence stars
Charlotte M. Norris, Yvonne C. Unruh, Veronika Witzke +5
Magnetic features on the surface of stars, such as spots and faculae, cause stellar spectral variability on time-scales of days and longer. For stars other than the Sun, the spectr…
Long-term changes in solar activity and irradiance
Theodosios Chatzistergos, Natalie A. Krivova, Kok Leng Yeo
The Sun is the main energy source to Earth, and understanding its variability is of direct relevance to climate studies. Measurements of total solar irradiance exist since 1978, bu…