Most mornings past two weeks, I wake up and find recent spots for K9W, T33A, etc being spotted on 10M and other high bands by EU stations. This is middle of the night in the Pacific. I minorly miffed when I was hearing W8A just great at my 5AM on 30M, then they announced they were QSY'ing to 17M where I have no hope (or do I?) of hearing them. Then just a few minutes ago they came back to 30M and they were easy to work.
Is there some new-to-me propagation circuit at these times? I myself have worked VK's and ZL's in the middle of my night on 10M in past several years, surprisingly loud signals possibly long path, but I don't really understand what pattern there is.
Maybe I should just realize that it's almost Summer in the south pacific, and the high bands can stay open well after sundown? Or is there something different at play? 15M was really glorious to EU well after their sundown, and sometimes after my sundown, this past summer for me.
During this time of year.. Around late October until Feb I believe.. an opening on the higher bands occurs... It's around the same time the South Pole is exposed in daylight. We here in KH6 can beam south west into Europe coming up around South Pole / SA and the signals can be very good. That's how I was able to work Zone 34 for my WAZ - 10M at around 11pm local time.
You can see the propagation in the models.. a thin line of higher MUF going under SA then open in the Atlantic.