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Fig. 2 | Earth, Planets and Space

Fig. 2

From: Source biases in midlatitude magnetotelluric transfer functions due to Pc3-4 geomagnetic pulsations

Fig. 2

Transfer functions and cross-phase analyses from sites shown in Fig. 1. The upper four plots in each column display the robustly estimated remote reference TFs for the indicated site. TF estimates were calculated with EMTF (Egbert and Booker 1986). In each of these plots, blue is used to denote TFs that involve the N–S magnetic field (X geomagnetic component: YX impedance element and Tx vertical field TF component) and red is used to denote TFs that involve the E–W magnetic field (Y geomagnetic component: XY impedance element and Ty vertical field TF component). The bottom plot in each column shows the calculated time-averaged cross-phase spectra for the specified pair of sites for the N–S (X) component of the magnetic field (estimated using the wavelet technique outlined in Waters et al. 2006). (See Additional file 1: Fig. S3 for TFs from NCT57 and IAL37; see Additional file 1: Fig. S4 for plots of the full impedance tensor from SCV57)

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