An Expanded System to Track Traveling Ionospheric Disturbances and Other Effects Using Doppler-shifts of AM Broadcast Stations

Traveling Ionospheric Disturbances, propagating variations in the ionosphere, can be tracked by observing the Doppler-shifted carriers of clear-channel AM broadcast stations.  A system of receivers using Software-Defined Radios frequency stabilized by GPS has been developed, deployed and collecting data in the northeast United States.  The existing system of 6 receivers will be built out to as many as 15 to cover much of the eastern US.  This expanded network promises to be able to detect and track these TIDs as well as terminator, Spread-F and eclipse effects.