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Grand solar minima occur when several solar cycles exhibit lesser than average activity for decades or centuries. Solar cycles still occur during these grand solar minimum periods but are at a lower intensity than usual. The grand minima form a special mode of the solar dynamo operation. [7] 400 year history of sunspot numbers.
The Maunder Minimum occurred between 1645 and 1715 when very few sunspots were observed. [11] That was not because of a lack of observations, as during the 17th century, Giovanni Domenico Cassini carried out a systematic program of solar observations at the Paris Observatory, thanks to the astronomers Jean Picard and Philippe de La Hire.
Solar Cycles Start (Maximum) Spotless days [10] Solar cycle 10–11 1860 – Feb 406 Solar cycle 11–12 1870 – Aug 1028 Solar cycle 12–13 1883 – Dec 736 Solar cycle 13–14 1894 – Jan 934 Solar cycle 14–15 1906 – Feb 1023 Solar cycle 15–16 1917 – Aug 534 Solar cycle 16–17 1928 – Apr 568 Solar cycle 17–18 1937 – Apr 269
The Homeric Minimum is a persistent and deep [1] grand solar minimum between about 800 and 600 BC. Cosmogenic beryllium-10 deposits in varves in a German lake show a sharp increase "2,759 ± 39 varve years before present", [2] [3] while carbon-14 is high starting around 830 BC. [4]
Solar cycles still occur during these grand solar maximum periods, but the intensity of those cycles is greater. Likewise, extended periods in which the solar maximum is lower than average are labeled "grand solar minima". Some researchers suggest that grand solar maxima have shown some correlation with global and regional climate changes ...
Large coronal mass ejections occur on average a few times a day at solar maximum, down to one every few days at solar minimum. The size of these events themselves does not depend sensitively on the phase of the solar cycle. A case in point are the three large X-class flares that occurred in December 2006, very near solar minimum; an X9.0 flare ...
Stark County is on the edge of the 124-mile-wide band in Ohio that will experience the total solar eclipse. The total eclipse will last for approximately three minutes and 40 seconds in parts of ...
Solar cycle 25 is the current solar cycle, the 25th since 1755, when extensive recording of solar sunspot activity began. It began in December 2019 with a minimum smoothed sunspot number of 1.8. [ 2 ]