== See also ==*Maunder minimum==Notes====References==*Komitov, Boris and Vladimir Kaftan (2004) "The Sunspot Activity in the Last Two Millenia on the Basis of Indirect and Instrumental Indexes: Time Series Models and Their Extrapolations for the 21st Century", in "Proceedings of the International Astronomical Union", 2004, pp.
* Komitov, Boris and Vladimir Kaftan (2004) «The Sunspot Activity in the Last Two Millenia on the Basis of Indirect and Instrumental Indexes: Time Series Models and Their Extrapolations for the 21st Century», in "Proceedings of the International Astronomical Union", 2004, pp.