Sprer Minimum (a hypothesized 90-year span of low solar activity) had eight events between 1010 and 2009, the most recent was Modern Maximum.
The Sporer Minimum is a hypothesized 90-year span of low solar activity, from about 1460 until 1550, which was identified and named by John A. Eddy in a landmark 1976 paper published in Science titled "The Maunder Minimum". Oort minimum Oort minimum Medieval maximum Wolf minimum Sporer Minimum Maunder Minimum Dalton Minimum Modern Maximum 1010 1050 1040 1080 1100 1250 1280 1350 1460 1550 1645 1715 1790 1830 1950 2009 
