Some ask what these mean.
See https://www.electronics-notes.com/articles/antennas-propagation/ionospheric/solar-indices-flux-a-ap-k-kp.php for explanations.
10 Dec 2016
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Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
I have to confess I have no idea where these are and the callsign does not help. In a short while I shall look them up. This is a QSL card....
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