Current Sunspot Cycle Weakest In 190 Years – Recent Model Temperature Deviation Due To Solar Activity, Experts Say
By P Gosselin on 7. Oktober 2013
The (tired) sun in September 2013 and spectral progress
By Frank Bosse and Fritz Vahrenholt
(Translated/edited by P Gosselin)
Currently solar activity is especially low. Solar sunspot number (SSN) in September was at 36.9, and thus was just 36% of the usual mean value 58 months into the cycle. The sun continues to remain in an unusually weak cycle 24, which was characterized by a 1-2 year delayed start in November 2008. The following graphic shows the mean value (blue) and the current cycle (red) and the very similar sunspot cycle SC5 (light gray) which occurred during the Dalton Minimum of the early 19th century:
While The Year Without a Summer, in 1816, occurred during the Dalton Minimum, the prime reason for that year’s cool temperatures was the highly explosive eruption of Mount Tambora in Indonesia, which was one of the two largest eruptions in the past 2000 years.