11,400 year sunspot reconstruction. 1950 is year 0 on left side. SN=sunspot number. BP=years before present. Hatching marks the previous period of high activity more than 8,000 years ago which is similar to present level of activity. This period corresponds with the Southern Hemisphere warming associated with the w:Holocene Climatic Optimum. 2005. 11,000 Year Sunspot Number Reconstruction. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series #2005-015. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA.
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Solanki, S.K., et al. 2005. 11,000 Year Sunspot Number Reconstruction. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series #2005-015. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA.
11,400 year sunspot reconstruction. 1950 is year 0 on left side. * '''SN''': sunspot number. * '''BP''': years Before Present. Hatching marks the previous period of high activity more than 8,000 years ago which is similar to present level of a