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File:Sunspot Numbers.svg

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English: Numbers of sunspots since 1610.[1][2] Several periodic cycles are evident, most notably the 11 year (131 ± 14 month) cycle. The green line represents continuous monthly averages reported by the Solar Influences Data Center since 1749. The red data points represent sporadic observations since 1610.
  1. ↑ Hoyt, D.V.; K.H. Schatten (1998). "Group sunspot numbers: A new solar activity reconstruction. Part 1". Solar Physics 179: 189-219. Retrieved on 2008-07-31.
  2. ↑ Hoyt, D.V.; K.H. Schatten (1998). "Group sunspot numbers: A new solar activity reconstruction. Part 2". Solar Physics 181: 491-512. Retrieved on 2008-07-31.
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File:Sunspot numbers pl.svg (Polish translation)

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Date/TimeThumbnailDimensionsUserComment
current21:02, 1 August 2008Thumbnail for version as of 21:02, 1 August 2008660 × 400 (294 KB)SlashmeBigger text
20:46, 1 August 2008Thumbnail for version as of 20:46, 1 August 2008660 × 400 (299 KB)Slashme{{Information |Description={{en|1=Numbers of sunspots since 1610.<ref name='Hoyt-Schatten_a'> {{cite journal|title=Group sunspot numbers: A new solar activity reconstruction. Part 1|journal=Solar Physics|date=1998|first=D.V.|last=Hoyt|coauthors=K.H. Schat

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