Regular pulses bursts observation using a time of arrival lightning mapping system with dual channels

The waveforms of lightning discharges during a period of 15 minutes were checked. There are Regular Pulses Bursts (RPBs) in 83% lightning discharges. Statistical analysis of all the 693 RPBs in this period show that, typical width of pulses in RPBs is about 0.5-1 μs, typical interval between pulses of RPBs is about 2-10 μs and typical duration of RPBs is from 100 μs to 5000 μs. There is always chaotic pulses period prior to or after RPBs. Most RPBs tend to occur in the middle and later stages of lightning discharges. In general, RPBs associates with K-change, M-process or dart-stepped leader. We developed a solution to match pulses caught in seven stations automatically just using intervals between pulses. Then we analyzed some parts of lightning discharge in high temporal resolution (up to one dot per 2 μs or more). Four RPBs were mapped in three dimensional in a typical intracloud flash, and a dart-stepped leader was also mapped in negative cloud-to-ground flash, and some special RPBs were researched in this work.