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One historical long-term correlation between solar activity and climate change is the 1645–1715 Maunder minimum, a period of little or no sunspot activity which partially overlapped the "Little Ice Age" during which cold weather prevailed in Europe. The Little Ice Age encompassed roughly the 16th to the 19th centuries.
During the Maunder Minimum enough sunspots were sighted that 11-year cycles could be determined from the count. The maxima occurred in 1676–1677, 1684, 1695, 1705 and 1718. Sunspot activity was then concentrated in the southern hemisphere of the Sun, except for the last cycle when the sunspots appeared in the northern hemisphere.
Reconstruction of solar activity over 11,400 years. Sunspot numbers over the past 11,400 years have been reconstructed using carbon-14 and beryllium-10 isotope ratios. [10] The level of solar activity beginning in the 1940s is exceptional – the last period of similar magnitude occurred around 9,000 years ago (during the warm Boreal period).
Numerical climate modelling indicates that volcanic activity was the main driver of the Little Ice Age. [38] Sunspots themselves, in terms of the magnitude of their radiant-energy deficit, have a weak effect on solar flux. [39]
Solar cycles are nearly periodic 11-year changes in the Sun's activity that are based on the number of sunspots present on the Sun's surface. The first solar cycle conventionally is said to have started in 1755. The source data are the revised International Sunspot Numbers (ISN v2.0), as available at SILSO. [1]
CMEs often form around sunspots, although scientists aren’t entirely sure why. Sunspot formation is cyclical, and the current solar cycle has reached the highest number of sunspots since 2001 ...
Sunspot activity has been measured using the Wolf number for about 300 years. This index (also known as the Zürich number) uses both the number of sunspots and the number of sunspot groups to compensate for measurement variations. A 2003 study found that sunspots had been more frequent since the 1940s than in the previous 1150 years. [30]
Sunspot AR3664 visible on the bottom right part of the Earth-facing side of the sun on May 9, 2024. (NASA/ Solar Dynamics Observatory) Millions of people who went out of their way to find eclipse ...