David Archibald compares various sunspot metrics with the current Solar Cycle (SC) transition, SC23 – SC24November 5th, 2008 by Warwick Hughes
In the last week or so David has sent me the following graphics illustrating where we might be in the current SC23-SC24 transition period. These warrant an article on their own. I have changed the order from the original post. Comments mainly from David.
Spotless days per month graphic
This graph shows just how different the current solar minimum is compared to those of the second half of the 20th century and those of the second half of the 19th century. The data is smoothed and that is why there aren’t any months with 30 or 31 days.
A large number of spotless days means that the following cycle is going to be late, and the later a cycle is, the weaker it will be.
This graph points to Solar Cycle 24 being very weak.
Comparison of the progress of Solar Cycle 23 to the minima of the late 20th century and the late 19th and early 20th century.
This graphic made by David is for anybody who doubts Svensmark theory that galactic cosmic rays control climate. All the major cold periods are associated with higher Be 10, including the cold period at the end of the 19th century. The 20th century warming is clearly associated with lower galactic cosmic rays, and thus a more active Sun.
David has a bit of fun with this graphic which is aligned on the previous solar minimum. Solar Cycles 3 and 4 prior to the Dalton Minimum had very similar shapes and amplitudes to Solar Cycles 22 and 23.