SuperDARN Observations of Medium Scale Traveling Ionospheric Disturbances in the Northern and Southern Hemispheres

V Lynn Harvey, Laboratory for Atmospheric and Space Physics, Boulder, United States, J. Michael Ruohoniemi, Virginia Polytechnic Institute and State University, Blacksburg, United States, Francis H. Tholley, The University of Scranton, Computing Sciences, Scranton, United States, Joseph B. H. Baker, Virginia Tech, Blacksburg, VA, United States and Nathaniel A Frissell, The University of Scranton, Physics and Engineering, Scranton, United States