At Heliogenic Climate Change, James Marusek, a retired USN physicist, discusses the continuing lack of sunspot activity and what it may portend for Earth’s climate:
So what does this all mean? Well, the sun’s interplanetary magnetic field has fallen to around 4 nT (nano Tesla) from a typical value of 6 to 8 nT. The solar winds pressure is down to 50 year lows. And the heliospheric current sheet is flattening. All these changes allow high-energy galactic cosmic rays to penetrate deeper into our solar system. In 2009, cosmic ray intensities have increased 19% beyond anything we’ve seen in the past 50 years, when satellite measurements began. Greater numbers of galactic cosmic rays driving deep into our atmosphere cause greater cloud formation (through ionization) which then results in decreasing surface temperature on Earth. This is because low level clouds reflect sunlight back into space. This is why Northern and Southern hemispheres have experienced unusually cold winters during the past couple years. The influence of the sun’s magnetic field is a force to be reckoned with in natural climate change.
Sorry, O Goracle.
More on the Svensmark theory of the interrelation of clouds, the sun, and cosmic rays in Earth’s climate.