Fig. 3From: Effect of a huge crustal conductivity anomaly on the H-component of geomagnetic variations recorded in central South AmericaNighttime ULF waves in Pc3 and Pc5 bands after narrow band filtering. a Pc3 pulsation with center frequency in 30.3 mHz and frequency bandwidth of ±4 mHz. b Pc5 pulsation with center frequency in 3.33 mHz and frequency bandwidth of ±0.4 mHzBack to article page