Far East from Europe by E layer on 6m

Regularly, at this time of year, there are openings from Europe to the Far East on 6m.  This happens year after year about now. 

It appears to be linked to the formation of noctilucent clouds in the mesosphere. These are forming more frequently now because of global warming.  With weak signal modes like FT8, these are being spotted more often.

I have copied Far East stations on 6m several times now, although my 2.5W has never been enough!

See https://sites.google.com/view/g3xbm4/home/vhfuhfmicrowaves/super-dx .