[OKDXA] Interesting propagation question

[John Geiger]

This afternoon at 2200Z I worked OH0Z from Aland Islands on 15 CW.  That
should be 11pm local for them, several hours after sunset.  He was putting
in a great signal, S5 or so, but no other EU stations where heard at all.
I am sure his Northerly location played a part.

What propagation mechanism was likely at play?  I am guessing it had to be
more than just F2 as it was several hours into darkness for OH0, and the
MUF should have been below 21mhz at that time local.  Could it be an
Auroral-Es to F2 link?  Any other ideas as to the type of propagation?

73 John AF5CC