On Aug 17, 2:35 am, "Morgans" wrote:
In a gross simplification, cloud to ground flashes produce disturbances in
the LF and VLF EM bands. They are received over very long distances, so
they are easier to get a map of over a complete region, even with a sparse
location of sensors. Probably why it is desirable.

Cloud to cloud flashes are mainly in the VHF range, and therefore are line
of sight.

Now explain why the system saw no strikes when 25 and 40 direct
lightning strikes hit the Empire State Building and WTC annually. I
have long been waiting for that answer. Do strikes to tall buildings
not create LF and VLF EM radiation?