Sunspot number recalibration - a new article published in the latest issue of Solar Physics

American Association of Variable Star Observers (AAVSO)
Wed, 04/19/2023 - 00:18

Of likely interest to this group is a recent article in Solar Physics (V. 298, Issue 3) titled "Recalibration of the Sunspot-Number: Status Report." The article describes differences in observations experienced by solar observers and the challenges of reconstructing historical sunspot data. It's a good read that offers a brief overview of the history of Sun-watching.

Find the abstract and article at

January SB

Hi Ricardo,

Take a look at the January 2023 Solar Bulletin:

It has a reference to what you are talking about.