Solar activity
Each row is one rotation of the Sun (a Carrington rotation, about 27 days); each cell is one day, coloured by the community mean Wolf number.
Wolf number (K)Naked eye (A) ⚠Warning — Your eye must be behind a suitable filter! Never look at the Sun without proper visual protection! Can cause serious eye damage or blindness!
CR 2215Mar 12, 2019
CR 2214Feb 13, 2019
CR 2213Jan 16, 2019
CR 2212Dec 20, 2018
CR 2211Nov 23, 2018
CR 2210Oct 26, 2018
CR 2209Sep 29, 2018
CR 2208Sep 2, 2018
CR 2207Aug 6, 2018
CR 2206Jul 9, 2018
CR 2204May 16, 2018
CR 2203Apr 19, 2018
CR 2202Mar 22, 2018
CR 2201Feb 23, 2018
CR 2199Dec 30, 2017
CR 2198Dec 3, 2017
CR 2197Nov 6, 2017
CR 2196Oct 10, 2017
CR 2195Sep 12, 2017
CR 2194Aug 16, 2017
CR 2193Jul 20, 2017
CR 2192Jun 23, 2017
CR 2191May 26, 2017
CR 2190Apr 29, 2017
CR 2189Apr 2, 2017
CR 2188Mar 6, 2017
CR 2187Feb 6, 2017
CR 2186Jan 10, 2017
CR 2185Dec 14, 2016
CR 2184Nov 16, 2016
CR 2183Oct 20, 2016
CR 2182Sep 23, 2016
CR 2181Aug 26, 2016
CR 2180Jul 30, 2016
CR 2178Jun 6, 2016
Community Wolf number
North / South asymmetry
Data updated on Oct 16, 2026