I forgot to edit subject and trim so here it is again. There are a number of research and commercial ionospheric sounders running pretty much all the time. If you have a panadapter you can see and if listening hear them. Lots of info found using the search term: Chirp Sounding OR Sounder I found this one interesting.
I suspect there are also spread spectrum sounders running. 73, -Bob ah7i/w4 _________________ Topband Reflector Archives - http://www.contesting.com/_topband
