کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4451301 | 1311745 | 2007 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Waveshapes of continuing currents and properties of M-components in natural negative cloud-to-ground lightning from high-speed video observations Waveshapes of continuing currents and properties of M-components in natural negative cloud-to-ground lightning from high-speed video observations](/preview/png/4451301.png)
Continuing current is a continuous mode of charge transfer to ground in a lightning flash. The extent to which the continuing current contributes to the total negative charge lowered to earth is large. In order to study the waveshape of the continuing currents of natural flashes, we developed a computational algorithm that analyzes the pixels of the images obtained by a high-speed camera and plots luminosity-versus-time. Tower measurements have shown that during the continuing current phase of the flash the luminosity of the channel is directly proportional to the current that flows through it. Using this information it was possible to infer the continuing current waveshape for 63 natural discharges and classify them into six different types. Statistics on some characteristics of 345 M-components (that occurred during the same 63 events) are also presented. As far as we know, this is the first study on waveshapes of continuing currents for natural lightning.
Journal: Atmospheric Research - Volume 84, Issue 4, June 2007, Pages 302–310