Fig. 2From: High-latitude ionospheric irregularities: differences between ground- and space-based GPS measurements during the 2015 St. Patrick’s Day stormVariations in the interplanetary magnetic field (IMF) and geomagnetic parameters during March 15–20, 2015. From top to bottom: IMF Bz component, solar wind speed (Vsw), solar wind ram pressure (Psw), geomagnetic auroral electrojet index (AE) and index of geomagnetic activity (SYM-H). The red line indicates the sudden storm commencement (SSC) time (04:45 UT)Back to article page