Nightlights

The coronal mass ejection mentioned in this post from 13 May interacted with Earth's atmosphere on 15 May. And if you don't know by now, energized protons in the night sky = pretty colors.













"Auroras in Nebraska? California? Arizona? Believe it. On Saturday night, May 14th-15th, northern lights rippled across the United States during an intense geomagnetic storm. The display was triggered by a solar coronal mass ejection that struck Earth's magnetic field. So much for the quiet Sun."