Fig. 11
From: Geomagnetic and ionospheric response to the interplanetary shock on January 24, 2012
a The vTEC data (in TECu) from satellites with α > 15° in the Scandinavian sector from the KIRU GPS receiver for various GPS satellites (PRN#02, 04, 05, 10, 12, 13, 25, 29, 31) during the time period 1450–1520 UT. Bottom panel shows magnetic variations from station KIR (X-component in [104 nT]); b vTEC data (in TECu) from satellites with α > 15° in the Canadian sector from the CHUR GPS receiver for various GPS satellites (PRN#02, 04, 10, 13, 16, 23, 30). Bottom panel shows magnetic variations from station FCHU (X-component in 104 nT). Location of the ionospheric pierce points during the SC is shown in Fig. 2