Analysis of full-disc Ca II K spectroheliograms - III. Plage area composite series covering 1892–2019
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova, Sami K. Solanki, Dipankar Banerjee, Teresa Barata, Marcel Belik, Ricardo Gafeira, Adriana Garcia, Yoichiro Hanaoka, Manjunath Hegde, Jan Klimeš, Viktor V. Korokhin, Ana Lourenço, Jean-Marie Malherbe, Gennady P. Marchenko, Nuno Peixinho, Takashi Sakurai and Andrey G. Tlatov
A&A, 639 (2020) A88
DOI: https://doi.org/10.1051/0004-6361/202037746
