Despite this, there was a surprise appearance of numersous spots from HZ1SK around midnight, which is pretty unusual.
This is what a typical quiet day series of spots from HZ1SK very recently looks like here:
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| Typical propagation day. |
After the grey line period, HZ1SK disappears into the noise, usually to reappear as one of the first-heard stations here in the morning grey line period.
Not so last night, when things looked like this:
The only disturbance to the field was again at very high latitudes, related simply to the daily changes in the quiet auroral oval. The HZ1 spots appeared at around the time of the field restoring to flat conditions, which is something I see with other anomalous spots very often:
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| Norwegian line stackplot. Image: Tromso Geophysical Laboratory. |
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