Plage areas from seven historical Ca II K archives


Theodosios Chatzistergos1,2, Ilaria Ermolli3, Natalie Krivova2 and Sami K Solanki2, (1)INAF Osservatorio Astronomico di Roma, Rome, Italy, (2)Max Planck Institute for Solar System Research, Göttingen, Germany, (3)Istituto Nazionale di Astrofisica Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy
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