Photo.2 High current upward lightning discharge in winter and its current waveform

High current upward lightning discharge in winter and its current waveform

(C) Hokuriku Electric Power Co.  2001

A photo and a current waveform of a high current upward lightning discharge in winter, observed in January 2001 are shown. The bright discharge path shows an upward branch, manifesting that this lightning discharge was an upward flash launched from a radio tower of 80-m high. The radio tower was equipped with a current recording system, but the current waveform saturated at 140 kA. Obviously peak current was higher than 140 kA, while average peak current of summer lightning is 20 to 30 kA. On the right of the bright channel, a faint upward-branching another channel is visible. It simultaneously launched from an adjacent tower, indicating that upward lightning frequently occurs even from 80-m class towers in the cold season.

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