AstroEngine
http://www.astroengine.com/wp-content/uploads/2008/08/livingston-penn_sunspots2.pdf
"A linear extrapolation of these trends suggests that few sunspots will be visible after 2015."
"The number of sunspots visible on the Sun normally shows an 11-year periodicity, and the current sunspot cycle (cycle 23) had a maximum in 2001, and is entering a minimum phase with few sunspots currently visible. Our data show that there are additional changes occurring in sunspots, independent of the sunspot cycle, and these trends suggest that sunspots will disappear completely."
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