Flickering gamma-ray flashes, the missing link between gamma glows and TGFs - Nature
Briefly

Flickering gamma-ray flashes (FGFs) represent a novel phenomenon that bridges the gap between classical gamma-ray glows and terrestrial gamma-ray flashes (TGFs), exhibiting unique characteristics.
Unlike typical terrestrial gamma-ray flashes, FGFs are radio and optically silent despite their resemblance to multi-pulse TGFs, thereby introducing complexity in understanding atmospheric electricity.
Read at Nature
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