Quote:
Originally Posted by sheeny
A sunspot is an area of the sun's surface that is slightly cooler than the rest. It is caused by a strong local magnetic field that disrupts the convection of heat to the surface at that spot.
Sunspots usually vary in an eleven year cycle, but we've just recently gone through and extended minimum (not many sunspots).
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I was kidding, hence the
... it's been such a long time I thought most of us would have forgotten what they were!
This lull in solar activity is the reason I've held out on buying a solar filter
