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Lightning Map Courtesy of Blitzortung.org hobbyist lightning detection network.
Data supplied by Blitzortung network members using their home-built Blitzortung hardware.
Signal: In the image below it is clearly visible the signal emitted by the detector of lightning in real time.
In the absence of external disturbances, both the red and the green line, will flat line along the horizontal line
Current lightning: The below image shows our stroke rate.
The Blitzortung networks members build (from kit parts) the detector which monitors H-field (and now can do E-field) emissions from lightning strikes, and has a set of servers in Europe to correlate the Time-Of-Arrival at detectors v.s. GPS-time and uses that to locate strikes.
For those interested in more information about Blitzortung, there is a Blitzortung forum in the US at WXForum.net and a public forum .. to access the internal forum, there, you'll need to have a Blitzortung member id.