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Sunspot Archive

Question

Hello Sander Vancanneyt, (Webmaster & analyst Space Weather and Aurora), and website crew! 

My question is with regard to your archive of sunspot info.  The keepers of the International Sunspot Number registered sunspot activity on May 29, 2019, EISNcurrent-3.png.11621588b6ac733f877e2d91098d04b0.png.

 

Yet, your archive does not reflect that information.  Why is that?

 

Thank you for the wonderful website!

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That's because the source is different. May 29th had no visible sunspot regions and no spots, as well as the day before and after. SWPC gave out a SN of 0 which still seems corect. No region was numbered as well so it must have been a shortlived one that was registered in some stations of the SILSO network that record the SN. SWPC has their own counting 😉 

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