Los Alamos Sferic Array Investigation of Lightning VLF/VHF
Phenomenology
M J Heavner, D A Smith, A Jacobson, A Waldrum, J Harlin, and K
Eack
LAUR-00-4198
Florida/KSC LDAR Results
The 1999 LASA Florida expansion provided coordinated
observations with the Kennedy
Space Center (KSC) Lightning Detection and Ranging (LDAR) system.
Above, the histogram of delays between LDAR and LASA
events associated with LASA Narrow Bipolar Events (NBE)
are shown. Below, the temporally nearest LDAR event height is
plotted as a function of the LASA
derived height, overplotted on the FORTE/LASA height
distribution for NBEs. FORTE/LASA NPBE's are plotted as +'s,
FORTE/LASA NNBE's are plotted as triangles, and the
LASA/LDAR heights are plotted as filled diamonds. If the
heights of the VHF and VLF systems agreed, they would fall
along the line plotted.
Below, two examples of the LASA, LDAR,
and NLDN observations for .5 s of a lightning flash are
presented. The upper example shows a 500 ms period of
Sferic Array, LDAR, and NLDN observations (there are
no reported NLDN events). The lower event is a 500 ms
period of observations in which NLDN does report a
CG. The movies are 100 ms frames which repeat.
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