Sunspot drawing of 1987-8-31

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https://doi.org/10.7891/e-manuscripta-142793



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1987-08-31
06:30
Hs 1304.6:2002
https://doi.org/10.7891/e-manuscripta-142793
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
90 4 3 A -23 47
91 1 2 A -24 5
2 5 5