On 9/9/13 8:36 AM, Bob Smither wrote:
On 09/09/2013 07:59 AM, J. Forster wrote:
FYI:
<http://thunderstorm.vaisala.com/explorer.html>
Here is another one:
http://www.strikestarus.com/
That uses an ad-hoc network of Boltek detectors, which work ok. I had
one in 1999-2000 at work.. although as I recall, they do position by
using direction of arrival and have some scheme for turning "field
intensity" into "distance to stroke".
The NLDN uses time difference of arrival at multiple stations to come up
with a position, and then, knowing the distance, they can turn "received
field" into "stroke current".
If I were doing scientific research, or had a need for "validated"
lightning data, the NLDN (operated by Vaisala for the government) would
be my choice.
There's an even more sophisticated system for smaller areas (around
Huntsville, for example) that works at 80 MHz and can map the individual
segments of the lightning stroke. They definitely use GPS
synchronization and time difference of arrival at multiple receiver
sites. There are some truly awesome animations of data from this system
that show things like cloud to cloud lightning as it develops, as well
as more conventional cloud/ground strokes.
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