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start:earth_sciences:cids

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Compact Intracloud Discharges (CIDs)

“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.”

Source: Radiophysics and Quantum Electronics, Vol.58, No.7, 2015

Also see : Lightning

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