Fig. 30
From: Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars
Time series of North American SuperDARN MSTID, polar vortex, and geomagnetic activity indices for the 2012–2013 observational season. a Continental MSTID index (gray and blue traces) and daily number of good sampling windows (dotted line). Background color indicates daily MSTID score and classification, with MSTID-active days in reds and MSTID-quiet days in blues. b Polar Vortex Index. c Negative AE index. d SYM-H index. In all panels, gray traces show raw data while blue traces show a 4-day running mean smoothing. Adapted from Fig. 9 of Frissell et al. (2016)