Well, here we go again! More 'metallic bursts' at 24MHz - with an interesting new twist!
Below is another audio recording of FT8 signals, almost all from Asiatic Russia and Asia this morning (21/10/2020), where numerous bursts and pings are heard.
There's no doubt now that these rapid and usually transient signals are due to a band at the very edge of opening to DX distances, and involving multi-hop, possibly chordal hop Es, or Es-like structures (such as PMSE). A few minutes after this recording was made, my ~50W trnsmissions to the ENE were heard in VK6, confirming the long-distance signals at play.
Indeed, looking at MAARSY mesospheric radar, we can see there are quite significant PMSE (actually, non-summer, or winter echoes) patches drifting around at high latitudes in the past couple of days:
If you jump to 1:12 and start playing, you will hear a very clear and strange 'echo' effect that I've never heard before. The delay is quite long at light speed. The main echo comes in at 0.519 seconds (155,592km, or about 4 circuits around the Earth, if it is that path), and possibly echoed again for up to 3 seconds after the first ping if you listen carefully. It is heard again, more weakly at about 2:01. The delay must be, or is similar to, long-delayed echoes. The more I listen, the more complex and interesting this gets!
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