This image is at http://www.solen.info/solar/images/cycles23_24.png.
See https://arxiv.org/abs/1808.04868
See https://arxiv.org/abs/1808.04868
10 Nov 2018
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Chesterfield Islands
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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