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A compact intracloud discharge (CID), also known as a narrow bipolar event (NBE) or narrow bipolar pulse (NBP) is an intensive form of lightning that produces radio waves and scarce visible light. Lasting only a few millionths of a second (typically 20 us), these events are the most powerful known natural terrestrial source of radio waves in HF and VHF band.“
Source : Wikipedia
To date, the physical processes behind CIDs have not been explained :
Despite the multi-year studies of CIDs and the significant volume of experimental data accumulated to date, the nature of this phenomenon is in many respects unclear.â€
Source : Radiophysics and Quantum Electronics, Vol.58, No.7, 2015
Also see Lightningplugin-autotooltip__plain plugin-autotooltip_bigLightning
High powered lightning discharges are happening somewhere on Earth 100 times every second.
A possible mechanism for the very substantial electrical charges within the clouds was put forward in 1978. Following lab-based experiments, it was suggested that the …
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