The only two sudden appearances were from ON7KO at 22:30UT and 01:24UT. G0CCL also appeared from nowhere at 01:24UT. Nothing was then heard until the pre-dawn period.
The mid-Europe field looked like this:
Image: Tromso Geophysical Laboratory. |
Image: NOAA. |
With the auroral oval extending to the northern UK, I suppose it's no surprise that a couple of short skip signals came in, though one might have expected a few more.
The timing of the first ON7 spot coincides nicely with the peak of a sharp Z dip to the south, which leads me to think that precipitating electrons drifting across the pole from the day side were responsible. The second, 01:24UT spot was probably a small patch of auroral E.
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