G7IZU RRD Blog
18k3 | 20k25 | 24k0 19k6 20k1 22k1 23k4


D/L a text file of detected alerts here

  Click the image above for full-size. THIS SYSTEM HAS BETTER ACCURACY DURING THE DAYLIGHT HOURS  

Above is a plot of signals levels from various VLF UK and European radio stations over the last 11 hours
(click it to open the full-sized image)

Note: The orange trace is showing the max level of either HWU 18k3, ICV 20k25 or NAA 24k0.
 



This is the last six hours of GOES satellite X-Ray flux data to compare
(please note the different time-spans). Below is the 3-day plot.

A "sudden ionospheric disturbance" (aka "SID") is evidenced by a characteristic shark fin shaped waveform.




 


View View VLF Stations monitored by G7IZU in a larger map

 

Google map showing the locations of VLF transmitters monitored by this site. Click on the placemarks to identify the stations.


Further details and descriptions will be added later.


 

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This website is Copyright 2004-2013 Andy Smith G7IZU.
Re-use of original graphics, data and alert systems on other websites is expressly forbidden,
unless prior authorization has been obtained from myself.
Email: g7izu (at) television.f9.co.uk
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