𝔖 Bobbio Scriptorium
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Periodicities of the de la rue Sunspot Area Measurements

✍ Scribed by J.M. Vaquero; M.C. Gallego; F. Sánchez-bajo

Book ID
111611887
Publisher
Springer
Year
2003
Tongue
English
Weight
256 KB
Volume
218
Category
Article
ISSN
0038-0938

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Since 1892 daily drawings of sunspot pores and sunspots have been made, at Catania, using the Cooke refractor (15 cm/223 cm) on a projected image of 24.5 cm. The results of these observations were published periodically from 1892 to 1955 in