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| Titel |
A performance assessment of the World Wide Lightning Location Network (WWLLN) via comparison with the Canadian Lightning Detection Network (CLDN) |
| VerfasserIn |
D. Abreu, D. Chandan, R. H. Holzworth, K. Strong |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 4 ; Nr. 3, no. 4 (2010-08-27), S.1143-1153 |
| Datensatznummer |
250001226
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| Publikation (Nr.) |
 copernicus.org/amt-3-1143-2010.pdf |
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| Zusammenfassung |
The World Wide Lightning Location Network (WWLLN) uses globally-distributed
Very Low Frequency (VLF) receivers in order to observe lightning around the
globe. Its objective is to locate as many global lightning strokes as
possible, with high temporal and spatial (< 10 km) accuracy. Since
detection is done in the VLF range, signals from high peak current lightning
strokes are able to propagate up to ~104 km before being detected
by the WWLLN sensors, allowing for receiving stations to be sparsely spaced.
Through a comparison with measurements made by the Canadian Lightning
Detection Network (CLDN) between May and August 2008 over a 4° latitude
by 4° longitude region centered on Toronto, Canada, this study found
that WWLLN detection was most sensitive to high peak current lightning
strokes. Events were considered shared between the two networks if they fell
within 0.5 ms of each other. Using this criterion, 19 128 WWLLN strokes
(analyzed using the Stroke_B algorithm) were shared with CLDN lightning
strokes, producing a detection efficiency of 2.8%. The peak current
threshold for WWLLN detection is found to be ~20 kA, with its
detection efficiency increasing from 11.3% for peak currents greater than
20 kA to 75.8% for peak currents greater than 120 kA. The detection
efficiency is seen to have a clear diurnal dependence, with a higher
detection efficiency at local midnight than at local noon; this is
attributed to the difference in the thickness of the ionospheric D-region
between night and day. The mean time difference (WWLLN − CLDN) between
shared events was −6.44 μs with a standard deviation of 35 μs, and
the mean absolute location accuracy was 7.24 km with a standard deviation of
6.34 km. These results are generally consistent with previous comparison
studies of the WWLLN with other regional networks around the world.
Additional receiver stations are continuously being added to the network,
acting to improve this detection efficiency. |
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