Fig. 4
From: Vertical profile of atmospheric conductivity that matches Schumann resonance observations
Frequency spectra of computed vertical electric fields. Schumann resonance spectra in the vertical electric field computed for the uniform global distribution of thunderstorms. The smooth curve 1 is the power spectrum obtained in the reference model. Curve 2 (with dots) shows the similar spectrum relevant to profile 2 of Fig. 1. Line 3 (relevant to the right ordinate) depicts deviations (in %) from the reference curve