We saw this on our walk last week. Something looks odd with the tree rings. You may need to blow up the photo. Why are some rings white?
2 Dec 2023
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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.
We saw this on our walk last week. Something looks odd with the tree rings. You may need to blow up the photo. Why are some rings white?
Solar flux is 127 and the SSN 105. A=17 and K=4.
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