Fig. 3
From: Modulation of the ionosphere by Pc5 waves observed simultaneously by GPS/TEC and EISCAT
The cross-correlation function R(Δτ) of magnetic variations (upper panel) during time interval 1100–1130 UT at stations KIR-LOZ (Φ ~ 67.8°), longitudinally separated by ΔΛ ~ 15.4° in geographic coordinates, and of TEC variations (bottom panel) determined from the longitudinally separated by ΔΛ = 27.2° in geographic coordinates pierce points (Φ ~ 68.7°–69.8°) along receiver/satellite paths TROM/GPS9 and VARS/GPS28