This an interesting article about sunspots and the effects they have on earth.
Another interesting thing about sunspots is their effect on electromagnetic communications. Those of you old enough to remember the world before cable TV may remember something called "skip". You would go in and turn on the TV and instead of your usual channels, you would be getting one or more from further away. In our case it was channel 3 in Columbus, GA. That skip was caused by increased ionization of the upper atmosphere. The ionization caused radio waves to bend differently. The increased ionization was due to increased sunspot activity.
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