Tag Archives: Royal Greenwich Observatory

Counting Sunspots and Sunspot Inflation

Guest post by Dr. Leif Svalgaard The official sunspot number is issued by SIDC in Brussels http://sidc.be/sunspot-data/ . The [relative] sunspot number was introduced by Rudolf Wolf http://en.wikipedia.org/wiki/Rudolf_Wolf  in the middle of the 19th century. He called it the ‘relative’ … Continue reading

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