The glow of coronae (IMAGE)
Caption
The glow of coronae are much easier to see in the nearly pitch-dark environment of a meteorology and atmospheric science lab at Penn State, left. On right, the spruce branch produces coronae during a thunderstorm, yet there is too much visible light from the sun to see these coronae glows with our eyes.
Credit
William Brune / Penn State
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License
CC BY-NC-ND