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Upper-atmospheric lightning

rare transient luminous events that occurs over tops of thunder storms (red sprites, etc.)

Pronunciation
/ˈəpər - ˌætməsˈfɛrɪk ˈlaɪtnɪŋ/
/ˈʌpə - atməsˈfɛrɪk ˈlʌɪtnɪŋ/