10m F2? WSPR

WG2Z (5600km) was the first USA station to spot my 500mW on 10m WSPR today at 1200z. In the other direcction, I spotted N1MGO (5293km) just minutes earlier. CX2ABP (11127km) was spotted here at 1158z.

Apart from the USA and the one South American, all stations have been in Europe or near Asia. I assume this is F-layer or F-layer back-scatter, but guess some nearer EU stations could have been Es?

UPDATE 1450z:  My 1444z 10m 500mW WSPR transmission was spotted by 11 stations, all of whom, apart from 1, were in the USA and Canada.