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Fig. 5


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Table of solar activity observations of January and February 1872 carried out at the Roman College. The different columns record: the date, solar sunspot area (arbitrary units), the number and the extension of prominences, the extension of solar faculae. From the note Studii sull’Aurora Elettrica del 4 Febbraio 1872. G. Egidi (Egidi, 1872).

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