Fig. 3From: Ionogram inversion for MARSIS topside soundingThe inversion result for the MARSIS ionograms shown in Fig. 1. The solid curves show the true height profiles of the normalized plasma frequency calculated using the EOF-based inversion in Section 3. The crosses show the measured apparent data which corresponds to the scaled apparent data in Fig. 1. The circles show the apparent heights recalculated using Eq. (6).Back to article page