Occurrence of positive and negative polarity cloud-to-ground lightning flashes: Case study of CGR4 and GPATS data for Brisbane, Australia

Kuleshov, Y., Hettrick, P., Mackerras, D., Darveniza, M. and Jayaratne, E. R. (2011) Occurrence of positive and negative polarity cloud-to-ground lightning flashes: Case study of CGR4 and GPATS data for Brisbane, Australia. Australian Meteorological and Oceanographic Journal, 61 2: 107-112.

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Name Description MIMEType Size Downloads
Author Kuleshov, Y.
Hettrick, P.
Mackerras, D.
Darveniza, M.
Jayaratne, E. R.
Title Occurrence of positive and negative polarity cloud-to-ground lightning flashes: Case study of CGR4 and GPATS data for Brisbane, Australia
Journal name Australian Meteorological and Oceanographic Journal
ISSN 1836-716X
Publication date 2011-06-01
Year available 2011
Sub-type Article (original research)
Volume 61
Issue 2
Start page 107
End page 112
Total pages 6
Place of publication Melbourne, Australia
Publisher Bureau of Meteorology
Collection year 2012
Language eng
Abstract The occurrences of positive and negative polarity cloud-to-ground lightning flashes were detected by ground-based lightning flash counters CGR4 in Brisbane,Australia. Positive (negative) flashes constituted 2–5 per cent (95–98 percent) of total cloud-to-ground flashes. These results were compared with data obtained by a GPATS lightning location system over the period 2005–2008. It was found that prior to January 2007 the GPATS lightning location system was reporting an excessive proportion of ground flashes as being positive, with a correspondingly low proportion as negative. Over the same period, the CGR4 lightning flash counter reported positive to negative ground flash ratios consistent with those obtained by other researchers both in Australia and elsewhere using a range of instrumentation. The high proportion of positive ground flashes (up to 50 per cent) recorded by the GPATS lightning location system in Australia prior to 2007 may be attributed to one or more possible factors,including (i) changes in the processing of raw GPATS sensor data implemented in January 2007, (ii) upgrades to sensor firmware, and (iii) the installation of more GPATS sensors.
Keyword Kathmandu thunderstorms
Winter thunderstorms
10-Year
Ratio
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Information Technology and Electrical Engineering Publications
 
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