Last night, a moderate geomagnetic disturbance took place for a while. I wondered again whether this would show up in what I used to think was exclusively ground wave propagation. But this latest plot shows this not to be the case, as the reception ceases as the evening progresses.
Here is the plot of reception at G0LUJ of my daughter's 200mW into a 1/4 wave elevated vertical in an open field, marshy location.
See the blip? |
The sharp appearance from the noise is correlated, as seems to be most usually the case, with the recovery phase of the geomagnetic field from a disturbance. I assume it is a result of reconnection of field lines (which is why the magnetogram below shows a field disturbance at an earlier time, but the enhanced propagation and aurora do not occur until a bit later).
Here's the statistical aurora at 23:40UT, just after the activity had picked up:
NOAA/SWPC |
By 01:40UT, things were looking decidedly more lively:
NOAA/SWPC |
IRF/Kiruna. |
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