Helicopter-triggered lightning strikes is when a "helicopter itself [... is a main reason for a] lightning strike [... or hit. Other reasons] are needed to create the right conditions for helicopter"-"triggered lightning, which has been observed in [... the] North Sea [... and] sea near Japan".[1]
These lightning strikes happen especially[2] when there is snow fall and the temperature is around 0 degrees celsius.
The phenomenon has been studied for several years (as of 2015).[1]
Sources
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