The Sun's Angry Today - Let's Talk Geomagnetic Storms

Last week right before the geomagnetic storm that hit Friday, somebody asked me “Where is this happening?” This was a perfectly intelligent professional…but unfortunately he wasn’t literate in this particular area of science.
So, let’s talk about geomagnetic storms. What they are. Why they make the pretty lights in the sky. How dangerous they might be (yes, dangerous) to our civilization. And how we know they’re coming.
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