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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Sudden Ionospheric Disturbances (SID) can be caused by solar flares, and observed by ULF/VLF monitoring.
There are a number of online VLF/ULF observatories with live feed that one can look at:
The Northern Cross ULF/VLF Radio Telescope in Italy is one such, and you can look at its live output here:
I am very interested in ULF/VLF myself, but live close to a power station with a switching farm and double rows of giant pylons that radiate low frequency noise so well you'd think they had been designed to do it.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
I too had an interest in vlf/ulf, using this site a lot I too live near a national grid junction, about 300m ! My workmate has done a lot of vlf/ulf stuff, (Mark Stone ... trying to get membership here) including collecting lots of info. on early battlefield use of 'ground radio communications' he had a website but closed it down as he got upset with so many folks that copied his stuff to their website with neither permission nor acknowledgement
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Sulaiman wrote ...
(Mark Stone ... trying to get membership here)
Yes, we do see them come and go.
I may have mentioned elsewhere that I was a member of an online ELF group for several years, until I realised that all conversations came round - in the end - not to talk about ELF being a great tool for understanding the natural world, but to adversarial obsessions with Cold War-era 'national security'.
The quality of research and innovation by the Italian guys at Radio Waves Below 22kHz never fails to delight me - though they all seem to have big gardens to put up their antennas, or they live out in the countryside without a power pylon in site.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Similar for amateur radio, ... acres of antenna space (and seemingly no limit on transmit power! Italians come blasting through here in uk) and me in a suburban semi-d. surrounded by trees and pylons (must bragg a little...first time on air, 20m, Midlands to Newfoundland 5&9 !!)
For elf/ulf/vlf work, a battery powered recorder and equipment in a remote hide are required to operate on this crowded island.
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Unusual solar activity
