Fig. 8From: ULF impulsive magnetic response at mid-latitudes to lightning activityThe wavelet scalogram and Fourier power spectra of the artificial paired modeling impulses with the same polarity (left-hand bottom panels) and opposite polarity (right-hand bottom panel). The initial signal (upper panels) is mimicked as shown by the grey line, the acquisition system response with the account of the conversion function (Fig. 1) is denoted by dark line.Back to article page