Tag Archives: Rudolf Wolf

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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Solar Activity – Past, Present, Future

Essay/paper by Dr. Leif Svalgaard Abstract As our civilization depends increasingly on space-borne assets and on a delicate and vulnerable earth-bound infrastructure, solar activity and its potential impact becomes of increasing importance and relevance. In his famous paper on the … Continue reading

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Is there a planetary influence on solar activity? It seems so according to this new paper

Guest post by David Archibald   Long suspected, it seems that this has now been confirmed by a paper in Astronomy and Astrophysics with the title “Is there a planetary influence on solar activity?” by Abreu et al that was … Continue reading

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