Documents Sunspots, Solar Cycle, and Observing the Sun

Sunspot Evolution What We Don’t Know What are the precise causes of flares and CMEs? Why do sunspots cycle in an 11 year cycle? Why is the corona is hotter than the photosphere?…

Documents 1 Updating the Historical Sunspot Record Leif Svalgaard Stanford University SOHO-23. Sept. 25, 2009.

Updating the Historical Sunspot Record Leif Svalgaard Stanford University SOHO-23. Sept. 25, 2009 The Sunspot Record(s!) The Sunspot Record goes back 400 years and is the…