Title: Very low frequency radio observations of lightning discharges (AARDDVARK)
The AARDDVARK/WWLLN Very Low Frequency (VLF) Radio Sensor was installed at Arrival Heights from 10-15 December 2008 by Dr
Craig J. Rodger and Dr. James Brundell as part of Antarctica New Zealand Event K069a. The sensor measures the magnetic field
in the Very Low Frequency radio range (~500 Hz-50 kHz), and passes it to a PC which processes the data for the experiments.
The primary experiment is the AARDDVARK observations. The secondary experiment, WWLLN, uses exactly the same VLF feed but
processes it to detect the radio-wave pulses from lightning. WWLLN observations are sent to a central processing computer
to determine the time and location of lightning pulses all over the globe. The World Wide Lightning Location Network (WWLLN)
is an experimental Very Low Frequency (VLF) network of sensors being developed through collaborations with research institutions
across the globe. The network exploits the considerable electromagnetic power radiated by lightning as "sferics" present in
the VLF band. By combining radio-pulse observations from at least 5 stations, the WWLLN central processing computers can determine
the location of the original lightning discharge. As the radio-pulse observations are immediately sent back across the internet
to the central processing computers locations are generated within ~10 s of the discharge, and thus near real time. There
are currently 33 active VLF receiving stations operating in the VLF World-Wide Lightning Location Network as of December 2008,
including the "Scott Base" measurements made at Arrival Heights. WWLLN observations are continuously transmitted to one of
the WWLLN primary servers, in this case flash.ess.washington.edu at the University of Washington, Seattle, USA.
The data is available from the WWLLN.
WWLLN Monthly CDs containing all stroke locations over the whole world for 1 month. These are mailed to subscribers each month,
or they may opt to download the data weekly. Archival data are available for sale from January 2004 to the present. Our site
hosts receive a free monthly subscription.
WWLLN Data are available via internet with cadence every 10 minutes for research purposes from the University of Washington,
or with a cadence of as fast as every minute (i.e. in realtime) from our commercial reseller. Contact Prof. Holzworth for