K-type breakdown process of intracloud discharge in Chinese inland plateau (SCI)
摘要
Some special features of lightning discharges in the eastern area of Qinghai-Tibetan Plateau have been investigated through multi-station measurements of wide-band slow antenna systems synchronized by Global Positioning System (GPS) with a time resolution of 1 μs. The K-type breakdown processes during one intracloud (1C) discharge were analyzed using the time differences of radiation pulses arriving at different stations. It was found that K-type breakdown processes during IC discharge started from a negative charge region and propagated downward to the lower positive charge region with an average speed of 1.5 × 107 m/s. The altitude of negative charge region was between 5.0 and 6.0 km above ground, while tbat of positive charge region was between 2.5 and 3.5 km above ground.