The Maunder Minimum, also known as the `prolonged sunspot minimum,` is the name used for the period starting in about 1645 and continuing to about 1715 when sunspots became exceedingly rare, as noted by solar observers of the time. The term was introduced after John A. Eddy published a landmark 1976 paper in Science. Astronomers before Eddy had .....
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http://en.wikipedia.org/wiki/Maunder_Minimum
(from the article `plasma`) ...extended and the solar wind is fierce. Sunspot activity waxes and wanes with roughly an 11-year cycle. During the mid-1600s and early 1700s, ... ...since 1750. (Estimates range from 0.06 to 0.3 watt per square metre.) Even more challenging, given the lack of any modern analog, is the ... [2 related arti...
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http://www.britannica.com/eb/a-z/m/51
Period from 1645 to 1715 during which the Sun had very little sunspot activity.
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http://www.physicalgeography.net/physgeoglos/m.html
the name given to the period roughly from 1645 to 1715, when sunspots became exceedingly rare, as noted by solar observers of the time.
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http://www.translationdirectory.com/glossaries/glossary304.php
The period from 1654 to 1714 when it was believed that there were no sunspots. It is now thought that there were some sunspots during that time but less than the numbers counted after 1800.
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https://www.encyclo.co.uk/local/20128
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