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| Titel |
Location accuracy of long distance VLF lightning locationnetwork |
| VerfasserIn |
C. J. Rodger, J. B. Brundell, R. L. Dowden, N. R. Thomson |
| 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 ; 22, no. 3 ; Nr. 22, no. 3 (2004-03-19), S.747-758 |
| Datensatznummer |
250014799
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| Publikation (Nr.) |
 copernicus.org/angeo-22-747-2004.pdf |
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| Zusammenfassung |
An experimental VLF WorldWide Lightning Location (WWLL) network is being
developed to provide realtime locations of cloud to ground lightning discharges occurring
throughout the globe. This network has expanded from a limited number of stations in the
Western Pacific to its current state of 11 stations, in most longitude sectors, with additional
stations planned in the near future. As part of the initial testing phase of the WWLL the
network has operated in a simple mode, sending the station trigger times into a central
processing point rather than using the sferic Time of Group Arrival (TOGA). During this
initial stage, a significant quantity of lightning location data has been collected, some of
which is being applied to research questions. In this paper the operation of the WWLL
network is described, and the location accuracy of the pre-TOGA WWLL network is
characterised. This is performed by contrasting commercial lightning location data from an
Australian network, Kattron, over 2 days in January 2002, with 4 WWLL stations covering
the same region. It was found that there were 426 matched lightning events, corresponding to
lightning discharges with large lightning return stroke peak currents (mean absolute peak
current of ~26kA compared with ~12kA for all Kattron events). By considering the random
errors in the difference locations between the matching lightning events, an appropriate
Gaussian timing error for the WWLL network of receiving stations is determined, and hence
an estimate for the global location errors for the existing 11-station network is found. The
"worst-case" global location error for the existing network ranges spatially from 7.5–100km,
with the global median being 15km, and the global mean 30km. When the TOGA method is
implemented, the station timing errors will decrease, allowing for an increase in the location
accuracies. Hence, the location accuracy estimates determined in this paper will be very
conservative for the future WWLL network employing the TOGA technique.
Key words. Meteorology and atmospheric dynamics (lightning,
atmospheric electricity, instruments and techniques) |
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