WSJT
Joe K1JT has developed excellent software for Amateur radio communication.
It supports Meteor Scatter, utilizing very short periods of intense ionization caused by meteors entering the upper atmosphere. These patches of ionization reflect signals back to earth allowing radio stations to hear each other for a short time, (often less than 1 second). This propagation is most often used at VHF, though the effects can be observed up to low UHF
The software also allows for very weak signals to be decoded at a signal strength below that which a human operator can hear. This is particularly effective for EME (moonbounce) where the distance means the signals are always very weak.
Much more detail is available on the K1JT website
I have now over 500 QSOs completed with this excellent software!
Recordings and anomalies observed
I have been running regular tests with these modes for over a year. a very small number of 'hard' false decodes have been observed and the occasional wav file that crashes WSJT , but plays ok
Hard false decode (SM3BIU sked) zip file, 6m ionoscatter JT65A with and without audio birdie (2 wav files)722Kb
Wav file that crashes WSJT (SM3BIU sked) zip file, 6m ionoscatter JT65A 384Kb Recorded 5 Feb 05
Wav file that crashes WSJT (SM3BIU sked) zip file, 6m ionoscatter JT65A 404Kb Recorded 14 April 05
Severely distorted (mulyipath) signals from GD0TEP working ZL the path to GD from here goes through 307 wind turbines, which may be responsible for the multipath effects observed on the signal!