Characteristics of Storm-Time Mid-Latitude MSTIDs in SuperDARN and GPS TEC

Medium-scale Traveling Ionospheric Disturbances (MSTIDs) are prominent and ubiquitous features of the mid-latitude ionosphere, and are regularly observed in Super Dual Auroral Radar Network (SuperDARN) and high-resolution Global Positioning System (GPS) Total Electron Content (TEC) data. The sources driving these MSTIDs are still an open area of research, especially during geomagnetic storms. Previous studies have demonstrated that MSTIDs are usually associated with either electrodynamic instability processes or atmospheric gravity waves. In this study, we present two mid-latitude MSTID events observed in both detrended GPS TEC data and SuperDARN radars over the North American sector, during strong geomagnetic storms. In SuperDARN, MSTID signatures were observed in ionospheric backscatter with line-of-sight velocities reaching 800 m/s. In detrended GPS TEC, these MSTIDs produced perturbations reaching ~50% in magnitude. We will determine the characteristics (direction of propagation, phase speed, and time period) of the observed MSTIDs in both SuperDARN and GPS TEC, and examine the consistency between both the datasets. In addition, we will examine the dependence of SuperDARN backscatter power and line-of-sight velocities on TEC enhancements/depletions to determine the role of electrodynamic instabilities in driving these storm-time MSTIDs.