Yesterday morning, I decided to re-tune the loop to 30m and see where the 200mW WSPR signal got to.
I am not sure what antenna other people are using at 10MHz, but my loop is doing better than any others I can find from the UK, by quite a big margin. This is surprising, as a 10MHz antenna is not so large - just 7m per side as a dipole, or 7m tall as a vertical - as to preclude most people from having a full-sized, efficient radiator.
It's too early for a full analysis of spots yet. But I did note that geomagnetic disturbances overnight generated interesting propagation enhancements throughout the dead of night. Curiously, as the early morning period advanced, a periodicity between spots of an hour, or multiple of an hour, seemed to become apparent. I will have to think about that one, but this paper is an interesting place to start, not least because the proposed modulation period occurs in agreement with my spots:
|Magnetometer stackplot, 19-20/11/2018, Norwegian line.|