Upper-atmospheric lightning

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What Wikipedia says

Upper-atmospheric lightning and ionospheric lightning are short-lived electrical-breakdown phenomena that occur well above the altitudes of normal lightning and storm clouds. Upper-atmospheric lightning is believed to be electrically induced forms of luminous plasma.

Excerpt from the Wikipedia article “Upper-atmospheric lightning”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Abestrobi, CC BY-SA 3.0, via Wikimedia Commons.