Doug Speheger (KC5JUS) recently gave a great presentation to the South Canadian Amateur Radio Society (SCARS) about Sporadic E.
Sporadic-E propagation allows amateur radio operators to send and receive signals over huge distances, through the ionosphere during brief and crazy circumstances. Doug Speheger KC5JUS has been watching this happen for years, and he has tracked many sporadic-E paths over this time. This youtube video explains the phenomenon a bit better. He talks about 2m, 6m, and broadcast band paths.
It’s probably a bit much to get him to come over and give a talk to us here in Dover, but the video is worth a watch if you have some spate time.