Sunspot drawing of 1971-2-28

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https://doi.org/10.7891/e-manuscripta-96682



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1971-02-28
08:00
Hs 1304.5:4391
https://doi.org/10.7891/e-manuscripta-96682
Observer : Sergio Cortesi
Seeing (SIDC) : 2
Group Not Weighted Weighted Type Latitude Carrington Longit.
56 10 C -17.5 140.3
57 9 H -8.7 126.2
60 3 J -9.9 107.6
62 15 D 6.1 73.1
67 3 J 24.2 47.9
69 7 C 7.1 33.8
70 3 B -13.4 107.6
7 50