Sharing this IEEE abstract, via Ward / N0AX:
Citizen Scientists Conduct Distributed Doppler Measurement for Ionospheric Remote Sensing.
“Doppler shift measurement using time standard stations as passive radar beacons is well-established as a means of estimating virtual ionospheric height. A community science experiment in distributed Doppler shift measurement was conducted in October 2019 using the time station WWV, on the event of that station’s centennial.”
Authors are Kristina Collins, KD8OXT, Aidan Montare, KB3UMD, David Kazdan, AD8Y, and Nathaniel Frissel, W2NAF.