Our restless sun
Might be laying down for some slumber -- from
New Scientist:
Solar maximum? Oh, you just missed it
Waiting for solar fireworks to reach a grand finale next year? Um, sorry, looks like you already missed them. Structures in the sun's corona indicate that the peak in our star's latest cycle of activity has been and gone, at least in its northern hemisphere.
The southern hemisphere, meanwhile, is on a sluggish rise to solar maximum and may not hit its peak until 2014.
This bizarre asymmetry strengthens a theory that has been bubbling among sun watchers for the past few years: our star is headed for hibernation. Having the sun's outbursts turned off for a while would provide a better baseline for studying how they influence Earth's climate.
A bit more:
Such a large asymmetry between hemispheres could be a sign of big changes ahead, says Steven Tobias, a mathematician at the University of Leeds, UK, who models what drives the sun's magnetic field. According to his models, such a situation precedes an extended quiet phase called a grand minimum. "Changes in symmetry are more indicative of going into a grand minimum than the strength of the cycle," he says.
Grand minima can last for decades. The previous one took place between 1645 and 1715, and has been linked to the little ice age in Europe. A new one might also cause localised cold periods. Climate scientists might see a silver lining to being plunged into a deep freeze: a grand minimum offers ideal conditions for testing the effects of solar variability on Earth's climate (see "Our star's subtle influence").
Subtle influence my big fat hairy ass -- the sun drives our climate and the IPCC models do not incorporate this simple fact. 1998 was the warmest year on record and we have been cooling off ever since.
Posted by DaveH at September 26, 2012 1:16 PM