| Title |
Features and Statistics on the Magnetic Field Waveforms Radiated by Intracloud Discharges |
| Authors |
Bok-Hee Lee ; Dong-Moon Lee ; Sung-Cheol Cho |
| Keywords |
Intracloud discharge ; Lightning electromagnetic pulse ; Surge protective device ; Transient data acquisition system |
| Abstract |
This paper presents some features and statistics of electromagnetic pulses radiated from intracloud lightning discharges. The LabVIEW based-measurement system of time-dependent electromagnetic fields was constructed. The frequency bandwidth of the measuring system ranged from 300[Hz] to 1[㎒], and the response sensitivity was 2.78[㎷/nT]. The resolution and the maximum recording length of the data acquisition system were 12[bits] and 100[㎳], respectively. In the electromagnetic pulses radiated from intracloud discharges, a pronounced bipolar pulse appeared with one or more fast pulses superimposed on the initial front part of the bipolar pulse. The mean duration of intracloud discharges was 1.05±0.32[㎳], and an average of about 8 outburst pulses appeared for a period. |