The Sun drifts downward
NOAA today posted its monthly update of the solar cycle, showing the Sun’s sunspot activity in April. As always, I am posting it here, with annotations to give it context, as I have done since 2010.
The graph above has been modified to show the predictions of the solar science community. The green curves show the community’s two original predictions from April 2007, with half the scientists predicting a very strong maximum and half predicting a weak one. The red curve is their revised May 2009 prediction.
Though sunspot activity increased in April, it remained well below the predicted numbers from the 2009 prediction, as has sunspot activity generally done for this entire solar cycle.
Note that if you extrapolate the red curve of the 2009 prediction down to its end you find that the solar minimum was predicted to occur sometime after 2020. Based on the rate of activity we have seen for the past year, it is very possible that the minimum will occur sooner, and will likely last longer.
But then again, the sun does what the sun wants to do. We don’t exactly understand the root causes of the solar cycle, and can only watch it unfold time after time as we try to peel back its mysteries.
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This is truly a great time for solar scientists. With a decreasing sun output, they have the first hand at watching a cataloguing how the sun affects earth’s climate (and other planets climates). By evaluating the output at a wide variety of frequencies we should have a better understanding about how the different layers of the atmosphere interact and how energies are distributed and mixed. If the sun acts as during the Maunder or Dalton minima, we could have some breathtaking discoveries.
Phill O