Sunspot drawing of 1987-4-1

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https://doi.org/10.7891/e-manuscripta-143063



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1987-04-01
09:30
Hs 1304.6:1868
https://doi.org/10.7891/e-manuscripta-143063
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
22 5 9 C 4 294
1 5 9