منابع مشابه
Electromagnetic Field Due to Lightning Strikes to Mountainous Ground
The produced electric and magnetic fields due to lightning strikes to mountainous ground are determined in this paper. For the sake of simplicity a cone-shaped ground with finite conductivity is assumed to represent a natural nonflat ground. By this assumption, we deal with an axillary symmetrical structure so we use the cylindrical 2D-FDTD to save the simulation memory and time, dramatically. ...
متن کاملPositive and Negative Cloud-to Ground Lightning*
Positive cloud-to ground lightning (+ CGL) occurs in a minor fraction of all thunderstorms [1]. We propose that the microscopic mechanism is the same as in the more common negative CGL, whereas the different polarity is due to the macroscopic cloud dynamics [2]. The origin of collisional charging involves three stages in the basic process [3]. In the first stage kinetic roughening of the surfac...
متن کاملCloud-to-ground Lightning and Urban Areas
The effect of small urban areas on cloud-to-ground (CG) lightning activity is analysed for Spain. The results shown that the CG-flash number is enhanced within and downwind the most of towns considered and that large population and higher SO2 concentration contribute to the increase of the number of CG-flashes. INTRODUCTION AND DATA Several studies have reported that large cities of the USA are...
متن کاملInsights into the ground attachment process of natural lightning gained from an unusual triggered-lightning stroke
[1] We present measured electric and magnetic field and current derivatives from an unusual triggered-lightning stroke that was initiated by a dart-stepped leader and that involved an upward connecting leader. The initial rising portion of the current (integrated dI/dt) waveform is composed of a ‘‘slow front’’ rising to 20 kA in 2.2 ms, followed by a ‘‘fast transition’’ from 20 to 27 kA in 0.2 ...
متن کاملComparing high-speed video and Lightning Mapping Array observations to investigate the influence of ground strikes on lightning flash characteristics
This study presents exploratory observations for a set of 28 cloud-to-ground flashes recorded on highspeed video, each with a time resolution of 10,000 frames per second. The high time resolution, along with precise GPS timing, allows a detailed comparison of the videos with corresponding data from the Oklahoma Lightning Mapping Array (LMA). The LMA detects VHF radiation sources throughout the ...
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ژورنال
عنوان ژورنال: Monthly Weather Review
سال: 1934
ISSN: 0027-0644,1520-0493
DOI: 10.1175/1520-0493(1934)62<200b:lbotg>2.0.co;2