منابع مشابه
High-speed video observations of rocket-and-wire initiated lightning
[1] We present observations of a rocket-and-wire triggered lightning flash obtained with high-speed video cameras recording 5400 and 50000 frames per second (frame times 185 ms and 20 ms) with time-synchronized current and electric field measurements. Transient leader channels were observed with precursor current pulses occurring before the development of the sustained upward positive leader th...
متن کاملHigh‐speed video observations of a lightning stepped leader
[1] High‐speed video images of eight branches of a lightning stepped leader recorded at a frame rate of 300 kiloframes per second (kfps) (3.33 ms exposure) are analyzed, representing the fastest published frame rate measurements of stepped leader stepping by about 1 order of magnitude and the first observations of space stems/leaders associated with stepped leaders. Sixteen occurrences of space...
متن کاملObservations of stepping mechanisms in a rocket‐and‐wire triggered lightning flash
[1] We present 10 high‐speed video images that depict the bottom 150 m of a downward‐ negative, dart‐stepped leader in a rocket‐and‐wire triggered flash, recorded at 240 kiloframes per second (4.17 ms frame integration time), along with correlated measurements of the X‐ray emission at 50 m, electric field derivative (dE/dt) at 80 m, and the rocket‐ launch‐tower current beneath the leader. We ob...
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 ...
متن کاملInitial stage in lightning initiated from tall objects and in rocket- triggered lightning
[1] We examine the characteristics of the initial stage (IS) in object-initiated lightning derived from current measurements on the Gaisberg tower (100 m, Austria), the Peissenberg tower (160 m, Germany), and the Fukui chimney (200 m, Japan) and their counterparts in rocket-triggered lightning in Florida. All lightning events analyzed here effectively transported negative charge to ground. For ...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2009
ISSN: 0094-8276
DOI: 10.1029/2009gl038525