There's also Blitzortung.org which is a very interesting project.
They are receiving Sferics on the lower HF frequencies and tag them with GPS timestamps (with the PPS signal they are in the Nanoseconds precision range). A central server will then do the triangulation.
All with off-the-shelf hardware (STM32, etc.).
Their service is stable for many many years now.
(Offtopic: The STM32H7 ADC is great for many many things)
Whenever it thundered I used to love to take out my shortwave radio, tune into some empty frequency and be able to hear each individual lightning strike in realtime (even more realtime than the speed of sound would allow!)
I’d like to ask to repeat this experiment but with a ferrite core next to the sensor (touching it). On the low spectrum (below a few MHz?) the magnetic component in the electromagnetic wave becomes dominant. Which is why receivers in shortwave radio and in e.g. DCF77 use a ferrite antenna. The ferrite’s length should be perpendicular to the line formed by the sensor and the location of the storm.
Edit: you’re reading at 400 Hz so you’ll read phenomena below 200 Hz
Blitzortung is a little long in the tooth. Great tech, but the mapping doesn't let you get any detail. Lightningmaps.org scrapes the feed but will sometimes just completely stop functioning and never come back.
[0]"The sensors are basically a bearing antenna with a very accurate clock and a computer. A lightning discharge has a "signature" that allows the sensor's software to distinguish lightning discharges from all the other electrical noise in the world."
My kids love looking at that site whenever we have a thunderstorm. They like seeing a strike on the map, then watching the realtime animated shockwave arrive over our location at the same time the sound of thunder arrives.
Nice! Need to implement realtime lightning data in a project soon, WIS2 is great for overall weather details but doesn't have a good temporal lightning resolution. Has anyone reached out to both and done that recently with WWLLN and/or Blitzortung?
The former seems to have better coverage especially across the southern hemisphere.
Thanks a ton! Was afraid that that's the answer - and that there's no reasonably priced aggregator/abstraction layer, eg like https://open-meteo.com for ECMWF.
You rang ;-) I’m in the middle of adding more ECMWF data that will be released as open data starting October 1st. At the moment, only a limited set of lower-resolution (0.25°) ECMWF forecasts can be shared open-data. That’s going to change in a big way, though I can’t share more details just yet.
20th-century navigation used to operate like that, except using artificial radio sources—fixed beacons. I guess you could answer a lot of technical questions by looking at OMEGA, which, similar to lightning-generated RF, used the VLF range (3–30 kHz), and had global range bouncing off the ionosphere,
> "OMEGA was the first global-range radio navigation system, operated by the United States in cooperation with six partner nations. It was a hyperbolic navigation system, enabling ships and aircraft to determine their position by receiving very low frequency (VLF) radio signals in the range 10 to 14 kHz, transmitted by a global network of eight fixed terrestrial radio beacons, using a navigation receiver unit. It became operational around 1971 and was shut down in 1997 in favour of the Global Positioning System."
There is eLoran which is upgrade to LORAN-C and as accurate as GPS. I saw link here that China is deploying eLoran system. The range is only 1200 mi so it won't cover the middle of the oceans, but would provide backup to GPS.
What is the diameter of each point? Aka how localised can they determine where the lightning is? Are we to assume the centre is where the lightning is? As I can't seem to find this information which I feel would be quite useful.
> When the time of group arrival is measured with 100 ns absolute accuracy by several widely spaced receivers, it is possible to locate lightning to within < 5 km
They are receiving Sferics on the lower HF frequencies and tag them with GPS timestamps (with the PPS signal they are in the Nanoseconds precision range). A central server will then do the triangulation.
All with off-the-shelf hardware (STM32, etc.).
Their service is stable for many many years now.
(Offtopic: The STM32H7 ADC is great for many many things)