 |
| Titel |
Location accuracy of VLF World-Wide Lightning Location (WWLL) network: Post-algorithm upgrade |
| VerfasserIn |
C. J. Rodger, J. B. Brundell, R. L. Dowden |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 23, no. 2 ; Nr. 23, no. 2 (2005-02-28), S.277-290 |
| Datensatznummer |
250015138
|
| Publikation (Nr.) |
 copernicus.org/angeo-23-277-2005.pdf |
|
|
|
|
|
| Zusammenfassung |
| An experimental VLF World-Wide Lightning Location (WWLL) network has been
developed through collaborations with research institutions across the
globe. The aim of the WWLL is to provide global real-time locations of
lightning discharges, with >50% CG flash detection efficiency and mean
location accuracy of <10km. While these goals are essentially arbitrary,
they do define a point where the WWLL network development can be judged a
success, providing a breakpoint for a more stable operational mode. The
current network includes 18 stations which cover much of the globe. As part
of the initial testing phase of the WWLL the network operated in a simple
mode, sending the station trigger times into a central processing point
rather than making use of the sferic Time of Group Arrival (TOGA). In this
paper the location accuracy of the post-TOGA algorithm WWLL network (after 1 August 2003)
is characterised, providing estimates of the globally varying
location accuracy for this network
configuration which range over 1.9-19km, with the global median being 2.9km,
and the global mean 3.4km. The introduction of the TOGA algorithm has
significantly improved the location accuracies.
The detection efficiency of the WWLL is also considered. In the selected
region the WWLL detected ~13% of the total lightning, suggesting a
~26% CG detection efficiency and a ~10% IC detection
efficiency. Based on a comparison between all WWLL good lightning locations
in February-April 2004, and the activity levels expected from satellite
observations we estimate that the WWLL is currently detecting ~2%
of the global total lightning, providing good locations for ~5% of
global CG activity. The existing WWLL network is capable of providing
real-time positions of global thunderstorm locations in its current form. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|