the days of grief and woe are upon us

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OTOH the sky is pretty darn spectacular tonight!

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Try six meters, it might surprise you! :slight_smile:

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Dear propagation experts: I activated (G/SP-007) on 10m CW for 12 minutes at 1250UTC yesterday and worked US (NY, VA & GA) and EU (Greece, Spain, Poland and, er, Oldham and Clitheroe). Does a step function increase in the Kp index (like that 1 to 8) affect RF propagation immediately or is there a time delay (to ‘warm up’ the ionospheric electrons)? And would that very high Kp affect all the HF bands equally or more the lower (HF) ones?

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The chart shows the strongest observed effect in a 3hr window. So the 1200-1500 period could have had a K index of 0-1 until the last few minutes of the window. At 1250, the storm may not have started yet.

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For this reason I use this slightly modified index from the GFZ German Research Centre for Geosciences in Potsdam.

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Just after local midnight here the aurora was so bright that it was lighting up the patchy clouds like a sunset…

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