Sunspot drawing of 1974-12-20

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https://doi.org/10.7891/e-manuscripta-97863



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1974-12-20
08:45
Hs 1304.5:5563
https://doi.org/10.7891/e-manuscripta-97863
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
197 6 H 13.0 103.1
201 11 J 5.6 34.4
202 5 B -16.1 141.2
203 6 B 6.5 74.1
4 28