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- W2388879752 abstract "The initial processes in one multiple-stroke flash to ground have been discussed by using 4-site measurements of the electrostatic field changes synchronized by GPS on the ground in Zhongchuan area near Lanzhou. It has been found that ground flashes usually follow cloud discharges which lasted 170ms～300ms and consisted of several K-changes. The sources of a series of pulses included in 3 K-changes are located by using time difference of arriving different site. It is concluded that K-changes initiated from negative charge region in the middle part of the cloud in a manner of negative streamer, and propagated downward to the positive charge region at the bottom of the cloud with an average speed of 1.5×10 7m/s. Positive and negative charge center are located in 2.5～3.5km and 5.0～6.0km above the ground respectively. The cloud discharge before ground discharge is important for the initiation of ground discharge because of the well ionized discharge channel in the cloud. The speed of stepped leader below thunderstorm to the ground is about 2.7×10 5m/s. Dart leader propagates following the return stroke channel with a speed of 2×10 7m/s at the beginning, and becomes slower near the ground with a speed close to that of stepped leader." @default.
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- W2388879752 date "1998-01-01" @default.
- W2388879752 modified "2023-09-27" @default.
- W2388879752 title "INITIAL PROCESS DURING ONE NEGATIVE GROUND LIGHTNING DISCHARGE IN ZHONGCHUAN AREA" @default.
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