More Signs Of The Sun Slowing Down
by Anthony Watts, Watt’s Up With That, June 15, 2008
In my post from yesterday, I highlighted a paragraph from a NASA press release which touched on one of the final findings of the soon to be ended Ulysses spacecraft mission to study the sun:
“Ulysses ends its career after revealing that the magnetic field emanating from the sun’s poles is much weaker than previously observed. This could mean the upcoming solar maximum period will be less intense than in recent history.”
A few months ago, I had plotted the Average Geomagnetic Planetary Index (Ap) which is a measure of the solar magnetic field strength but also daily index determined from running averages of eight Ap index values. Call it a common yardstick (or meterstick) for solar magnetic activity.
… [T]he Ap Index has continued along at the low level (slightly above zero) that was established during the drop in October 2005. As of June 2008, we now have 32 months of the Ap hovering around a value just slightly above zero, with occasional blips of noise. … [more]