期刊
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
卷 56, 期 4, 页码 932-939出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEMC.2013.2293628
关键词
Electric field; electric field derivative; positive lightning; return stroke; waveform parameters
资金
- National Science Foundation
- Defense Advanced Research Projects Agency
In 2007-2008, 52 positive cloud-to-ground flashes containing 63 return strokes (52 first, 10 second, and 1 third) were recorded at the Lightning Observatory in Gainesville, Florida. The U. S. National Lightning Detection Network located 51 (96%) of the positive return strokes at distances of 7.8-157 km from the field measuring station and correctly identified 48 (91%) of them as cloud-to-ground discharges. In this study, parameters of positive return-stroke electric field and electric field derivative waveforms are examined. The geometric mean (GM) value of initial electric field peak normalized to 100 km for 48 strokes is 18 V/m. The GM peak electric field derivative normalized to 100 km for 27 strokes is 9.0 V/m/mu s. The GM zero-to-peak risetime and 10-to-90% risetime for 62 strokes are 6.9 mu s and 3.4 mu s, respectively, and the GM slow front duration is 5.0 mu s. The GM zero-crossing time for 42 strokes is 45 mu s and the GM opposite polarity overshoot for 33 strokes is 13% of the peak. These characteristics are compared with those of negative return strokes in Florida found in the literature.
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