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Why did so few people see Auroras on Friday night?

15 Sep 2014, 13:38 UTC
Why did so few people see Auroras on Friday night?
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Why did so few people see auroras on Friday night, after all the media hype? You can see one of two reasons in the data. As I explained in my last post, you can read what happened in the data shown in the Satellite Environment Plot from this website (warning — they’re going to make new version of the website soon, so you might have to modify this info a bit.) Here’s what the plot looked like Sunday morning.
What the “Satellite Environment Plot” on swpc.noaa.gov looked like on Sunday. Friday is at left. Time shown is “Universal” time (UTC); New York time is 4 hours later at this time of year. There were two storms, shown as the red bars in the Kp index chart (fourth line); one occurred very early Friday morning and one later on Friday. You can see the start of the second storm in the “GOES Hp” chart (third line), where the magnetic field goes wild very suddenly. The storm was subsiding by midnight Universal time, so it was mostly over by midnight New York time.
What the figure shows is that after a first geomagnetic storm very early Friday, a strong geomagnetic storm started ...

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