Even so, I was lucky to catch a minor geomagnetic disturbance last evening, which started around 19:30UT, and returned to quieter conditions by just after 00UT. This is the Kiruna plot:
Image: IRF/Kiruna. |
The Z component pulses are also interesting in this run. The other components showed no pulsations.
Z component magnetic pulsations. Image: IRF/Kiruna. |
EA8BFK is a very good receiver, and happens to lie on the exact-same terminator line as my location at this time of year. This is how he heard my 200mW. Time along the top, SNR up the side:
It's very interesting to note that my signal was quite weak, but then showed a two-peak phase starting around 21:35UT, when the field was approaching peak southerly deviation. There is a quieter trough around 22:30UT, just after peak field deviation. Then, as the field restores to normal, a sharp strengthening of my signal for a few minutes, peaking just after 23:00UT. That brief signal strength level was not seen again until the advance of dawn-time propagation.
So it seems that 30m, like 20m, provides enhanced propagation during geomagnetic events.
UPDATE.
I've also plotted DP0GVN hearing my 200mW at 10MHz on 08-09 February 2018, the same period as above.
The spots vanish in the approximate period 21:20 - 23:50UT, with a brief 'reconnection' at quite strong levels, but only for a couple of minutes, around 00:00UT. This superficially coincides with the field recovering to its quiet conditions at that time. So it looks like the geomagnetic disturbance caused a decrease in propagation in this north-south case.
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