Well done Andrew and David.
The above record (22 Jan 2010 0550 UTC 320 degrees) is both intriguing and instructive.
The prominent echo at 7300 km is likely to be from afternoon (or supermode) transequatorial propagation (TEP) - two reflections from the F-region equatorial ionosphere anomaly (EIA) without intermediate ground reflection, over a path of about 5000+ km. That is, the classic "chordal hop", dubbed F-F (whereas two F-region hops is 2F). Reaching this circuit then would likely have been by the Es hop shown at 2100 km. So, we have TEP extended by Es - also known in ionospheric circles as "mixed mode" propagation and dubbed Es-F-F. And here we are in the midst of the solar cycle doldrums :!:
The reflection at 3200 km ("reflections" around 3000 km ?) has me intrigued. Could it be a single F-hop, two 1600 km Es hops (in which case, where's the 1st reflection ?), or propagation "trapped" between two Es clouds, one above the other, for a distance ? The Canberra and Sydney ionograms aren't much help, the ionosondes being too far east of the propagation path (although both show Es). If I squint, however, I can see a bit of "lift" in the noise midway between the 1000 and 2000 km range lines.
Then there's the question of the multiple small echoes from about 5900 to 6600 km. Could they be scatter from small structures in the EIA ?
That's the exciting thing about results from new tools: they tend to throw up new questions along with answering old ones :!:
73, Roger Harrison VK2ZRH