28 MHz propagation after sunset

Interesting to see how the 10 meter band behaves after sunset. Yesterday evening WSPR activity with G and D was seen on my QTH JO22gb. The path crossing the ocean was with K9AN earlier that evening during daylight. I used 5 Watts RF into a G5RV jr antenna.

When thinking about the amazing results of WSPR last years I sometimes have the idea that there must be an undiscovered phenomenon that enables us to make worldwide WSPR links with less than 100 mW RF power. How about curved shapes in the propagation layers (like parabolic mirrors) that focus/concentrate the RF energy at the receiving spots ?