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Sunspot numbers: expected and actual

Sunspot numbers: expected and actual



The current sunspot number (solid line) compared with the predicted values (broken line) for cycle 23. The solar image shows the photosphere and a number of sunspots and was observed by the SOHO Michelson Doppler Imager (MDI) on May 10 1999.
Courtesy of SOHO/MDI consortium.
Last Update: 1 September 2019
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26-Dec-2024 09:40 UT

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