Long Duration SID.
Taken by Rob Stammes on July 12, 2012 @
Polarlightcenter,Laukvik, Lofoten, Norway.
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Details:
Today, july 12 2012, on my instruments a very long duration sudden ionospheric disturbance.Coming after a strong and long duration X1.4 solarflare from region 1520.But with only a little bit radio radiation on vhf,56.25 MHz.
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