In fluid dynamics, a Kármán vortex street (or a von Kármán vortex sheet) is
a repeating pattern of swirling vortices caused by the unsteady separation
of flow of a fluid around blunt bodies. It is named after the engineer and
fluid dynamicist Theodore von Kármán, and is responsible for such phenome
Japanese team sees gamma-ray pulse before lightning flash
http://physicsworld.com/cws/article/news/2013/jul/10/japanese-team-sees-gamma-ray-pulse-before-lightning-flash
Also see the preprint by the same team:
Hardening and termination of long-duration gamma rays detected prior to
lightning
http
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