Fig. 2From: Statistical analysis of ionospheric mid-latitude trough over the Northern Hemisphere derived from GPS total electron content data a, b The nighttime TEC latitudinal profile on 10 January 2003 (Kp = 2.5, F107 = 178.7). T M corresponds to the trough minimum position. T E and T P are the average TEC locations on the equatorward and poleward sides of the trough minimum, respectivelyBack to article page