Fig. 1From: High-latitude ionospheric irregularities: differences between ground- and space-based GPS measurements during the 2015 St. Patrick’s Day stormProjection of LEO–GPS satellite passes recalculated to the MLT–MLAT domain during the full day of March 17, 2015, for the Northern (top) and Southern (bottom) Hemispheres. Each row shows an increase in data coverage (from left to right) with sequential addition of a satellite to each graphBack to article page