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Spörer minimum
A period of low sunspot activity that lasted from about AD 1420 to 1570, based on evidence such as carbon-14 in tree rings and records of auroral activity. The Spörer minimum, and the similar Maunder minimum, coincide with a period of low global temperatures known as the Little Ice Age. It was discovered by the American solar physicist John Allen Eddy (1931–) who named it after Gustav Spörer.
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