Solar geomagnetic index reaches unprecedented low

From Watts Up With That Jan 7, 2009
Solar geomagnetic index reaches unprecedented low

...sunspots are just one proxy.. for magnetic activity of the sun. It is the magnetic activity of the sun which is central to Svensmark’s theory of galactic cosmic ray modulation, which may affect cloud cover formation on earth, thus affecting global temperatures.
Lower magnetic activity of the sun lets more GCR’s into our solar system, which produce microscopic cloud seed trails ... in our atmosphere, resulting in more cloud cover, resulting in a cooler planet.

With the Ap index dwindling to a wisp of magnetism, it bolsters the argument made by Livingston and Penn that sunspots may disappear altogether by 2015.

The theory goes that once the magnetic strength falls below 1500 gauss, sunspots will become invisible to us.

AP INDEX
For ap index see NOAA
Daily regular magnetic field variation arise from current systems caused by regular solar radiation changes. Other irregular current systems produce magnetic field changes caused by the interaction of the solar wind with the magnetosphere, by the magnetosphere itself, by the interactions between the magnetosphere and ionosphere, and by the ionosphere itself.

Magnetic activity indices were designed to describe variation in the geomagnetic field caused by these irregular current systems.