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Simultaneously measured current, luminosity, and electric field pulses in a rocket‐triggered lightning flash

发布人:news  |  来自:本站  |  发布时间:2011-05-28 08:08:15  |  点击次数:1830
Citation: Qie, X., R. Jiang, C. Wang, J. Yang, J. Wang, and D. Liu (2011), Simultaneously measured current, luminosity, and electric field pulses in a rocket‐triggered lightning flash, J. Geophys. Res., 116, D10102, doi:10.1029/2010JD015331.

全文下载:http://lageo.iap.ac.cn/uploads/110530160959g9c1plj7g0gu.pdf

Abstract:   Current, luminosity, and electric field pulses in a rocket‐triggered negative lightning  flash have been analyzed based on the channel base current, high‐speed video images, and  electric field changes at 30 m from the channel. Among the 31 distinct current pulses, there are 4 return strokes, 18 typical M components, 5 large M components with unusual large peak current in a range of kiloamperes, 3 initial continuing current (ICC) pulses, and 1 stroke–M component (RM) event which exhibits both return stroke and M component features. The geometric mean of peak current is 13.5 kA, half peak width is 28.4 ms, and risetime from 10% to 90% peak is 1.1 ms for the 4 return strokes, while the corresponding values are 243 A, 400 ms, and 319 ms, respectively, for the 18 typical M components and 5.1 kA, 76.3 ms, and 34.6 ms, respectively, for the 5 large M components. The electric field and current waveforms of ICC pulses exhibit features similar to those of theMcomponents,  indicating the similarity of their mechanisms. Detectable optical luminosity is found just prior to all the pulse events, even return strokes. The M components are superimposed on a slowly varying continuing current, while the directly measured current prior to the return  stroke is not significant. The simultaneous electric field and current waveform ofRMimplies a superposition of dart leader and M incident wave in the channel, and the possible reason is that two branches with common lower portions coexist simultaneously in the upper part of the discharge channel.

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