Fig. 1From: A case study of correspondence between Pc1 activity and ionospheric irregularities at polar latitudesThe dynamical spectrum (top panel) and \(SNR\left( f \right)\) (middle panel) of the horizontal magnetic field at MZS on 22 February 2007 between 0200 and 1400 UT, compared with the simultaneous AE index (blue line) and solar wind pressure P (red line) (bottom panel). Black contours in the dynamical spectrum indicate \(SNR\left( f \right)\) > 3Back to article page