First-ever constructed image of a terrestrial gamma-ray flash

First-ever constructed image of a terrestrial gamma-ray flash
Terrestrial gamma-ray flashes occur above some thunderstorms and propagate out into space. These high-energy discharges of photons were only discovered less than 25 years ago when a NASA spacecraft designed to observe cosmic gamma-ray bursts from outer space detected flashes that seemed to come from Earth itself.
phys.org
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