F2 and Es on 10m WSPR?

KK1D (5455km) was the first USA spot on 10m WSPR today at 1304z. There have been several USA spots since. As well as Africa, West Indies and Russia, I have had several 10m WSPR spots from "near" Europe. These could, I guess, be F layer backscatter or possibly Es?

UPDATE 1730z:  KC1AWS (5308km) is spotting me still. 

UPDATE 2035z:  KC1AWS (5308km) was the last USA station to spot me on 10m WSPR at 1812z. I went QRT on 6m many hours ago but am still active on 10m WSPR and may stay on overnight.