WWLLN - The World Wide Lightning Location Network

Time 2020-07-15 20:03:48

Web Name: WWLLN - The World Wide Lightning Location Network

WebSite: http://webflash.ess.washington.edu

ID:26456

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World,The,WWLLN,

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IT support for the network are deemed critical employees of the University of Washington and are thus available in case physical presence is needed on campus.NEW! PUBLIC ACCESS to TROPICAL CYCLONE MONITORING: wwlln.net/storms/ OTHER USEFUL LINKS WWLLN Lightning Visualization will terminate in December 2019 WWLLN backup webserver http://dudwlln.otago.ac.nz/ Global Lightning Climatology with amazing movies!. Volcano global monitor Explosive Ash Cloud Monitor, updated every minute. [See great interview with Dr. Van Eaton (USGS) about ash cloud lightning. https://physics.aps.org/articles/v13/44 and most importantly: WWLLN Publications: peer reviewed publications.Google Earth overlay for 1 hour of global data ending 6 hours ago is found HERE . Contact Prof. Holzworth at bobholz@washington.edu, Director of WWLLN, with any questions you may have. - click on image to get a bigger version - (Notes: cloud data thanks to National Weather Service/Aviation Weather Center;blue overlay dots are WWLLN Lightning; Red circles are WWLLN receivers; Redline is the terminator) University of Washington in Seattle operating a network of lightning locationsensors at VLF (3-30 kHz). Mostground-based observations in the VLF band are dominated by impulsive signalsfrom lightning discharges called sferics .Significant radiated electromagnetic power exists from a few hertz to severalhundred megahertz, with the bulk of the energy radiated at VLF.With our network of sferic sensors we are producingregular maps of lightning activity over the entire Earth. Our map showing theentire world uses coloured spots to indicatelightning strokes (red stars inside an open circle are active WWLLN lightningsensor locations). Click on the map for explanation.WWLLN Management Team, lead by Prof Robert Holzworth of the University of Washington produced these data and images with the cooperation of theuniversities and institutes which host the stations as listed below. Wideband VLF spectrograms from all WWLLN stationsare available this link or by clicking on the stationname below.We currently have over 70 sensors around the globe to detect sfericactivity in the VLF band, listed below in the order of their establishment: INPA (Brazilian National Institute for Amazon Research) - LBA Program, Manaus, Brazil Departamento de Fisica, Universidad Nacional de la Patagonia, Trelew, Argentina Laboratório de Análise e Processamento de Imagens de Satélites (LAPIS) Institute of Cosmophysical Research and Radio Wave Propagation, Russian Academy of Sciences Laboratorio de Física de la Atmósfera, Instituto de Investigaciones Físicas, Universidad Mayor de San Andrés Institute of Cosmophysical Research and Radio Wave Propagation, Russian Academy of Sciencesoffers of hosting a new WWLLN sensor to add to the list above. All hostsreceive all the world-wide data for their own research on monthly CDs. Inreturn, each host provides the computer and meets any local expenses likepower, Internet, and maintenance. However, do not think that a sensor onyour own campus is going to give you lightning location data on its own. Onlythe whole network does that.Each lightning stroke location requires the time of group arrival (TOGA) from aleast 5 WWLLN sensors. These sensors may be several thousand km distant fromthe stroke. The geographical arrangementof the sensors is important: a lightning stroke which is enclosed by sensors ismuch more accurately located than one which is not so enclosed. Clearly auniform spacing of sensors around the Earth is the ideal. Since the Earth isround, there are no edges: every lightning stroke is surrounded by sensors, butnot necessarily by the sensors which sense it. Typically only about 15 to 30%of strokes detected by one sensor are detected by 5 or more. Thesestrokes are usually the stronger ones. Recent research indicates our detectionefficiency for strokes about 30 kA is approximately 30% globally.To cover the whole world by sensors spaced uniformly about 1000 km apart wouldrequire roughly 500 sensors. If spaced 3000 km apart, we would need only around 50 to 60 sensors. Presently we have 40 WWLLN sensors,and we are in the process of expanding to 60 sensors within the next year ortwo. More informationMore information on the World WideLightning Location network (WWLLN) is available from our publication list: WWLLN Data availableWWLLN Monthly CDs containing all stroke locations over the wholeworld for 1 month. These are mailed to subscribers each month, or they may optto download the data weekly. Archival data are available for sale from August 15,2004 to the present. Our site hosts receive a free monthly subscription.WWLLN Data are available via internet with cadence every 10 minutes forresearch purposes from the University of Washington, or with a cadence of asfast as every minute (i.e. in realtime) from ourcommercial reseller. Contact Prof. Holzworth for more info. Contact forall questions relating to WWLLN: Prof Robert Holzworth, Earth and Space Sciences, University of Washington bobholz@washington.edu Webpage maintained by:Craig J Rodger (University of Otago)Robert Holzworth (University of Washington)Lightning image thanks to photolib.noaa.govWeb editing:Bob Holzworth (bobholz@washington.edu)

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