Animated sequence of MARSIS ionograms, with sound

An animated sequence of MARSIS ionograms (typical products of MARSIS radar sounding of the ionosphere), covering an entire pericentre pass on 14 August 2005. MARSIS detects electron cyclotron echoes, and derives the related frequency. This depends on the magnitude of the surrounding magnetic field. When the spacecraft passes over areas of higher magnetic field strength, the frequency changes. In this animation, we can hear it in the form of changing sound.