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| Titel |
Some features of stepped and dart-stepped leaders near the ground in natural negative cloud-to-ground lightning discharges |
| VerfasserIn |
X. Qie, Y. Yu, C. Guo, P. Laroche, G. Zhang, Q. Zhang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 20, no. 6 ; Nr. 20, no. 6, S.863-870 |
| Datensatznummer |
250014415
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| Publikation (Nr.) |
 copernicus.org/angeo-20-863-2002.pdf |
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| Zusammenfassung |
Characteristics of the
electric fields produced by stepped and dart-stepped leaders 200 µs just prior
to the return strokes during natural negative cloud-to-ground (CG) lightning
discharges have been analyzed by using data from a broad-band slow antenna
system with 0.08 µs time resolution in southeastern China. It has been found
that the electric field changes between the last stepped leader and the first
return stroke could be classified in three categories. The first type is
characterized by a small pulse superimposed on the abrupt beginning of the
return stroke, and accounts for 42% of all the cases. The second type accounts
for 33.3% and is characterized by relatively smooth electric field changes
between the last leader pulse and the following return stroke. The third type
accounts for 24.7%, and is characterized by small pulses between the last
recognizable leader pulse and the following return stroke. On the average, the
time interval between the successive leader pulses prior to the first return
strokes and subsequent return strokes was 15.8 µs and 9.4 µs, respectively.
The distribution of time intervals between successive stepped leader pulses is
quite similar to Gaussian distribution while that for dart-stepped leader
pulses is more similar to a log-normal distribution. Other discharge features,
such as the average time interval between the last leader step and the first
return stroke peak, the ratio of the last leader pulse peak to that of the
return stroke amplitude are also discussed in the paper.
Key words. Meteology and
atmospheric dynamics (atmospheric electricity; lightning) – Radio science
(electromagnetic noise and interference) |
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