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.”
https://ieeexplore.ieee.org/document/9377452
Authors are Kristina Collins, KD8OXT, Aidan Montare, KB3UMD, David Kazdan, AD8Y, and Nathaniel Frissel, W2NAF.