The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) is a radio frequency subsurface radar sounder designed to operate on the international Mars Express mission, an ESA program for the orbital and in-situ study of the subsurface, surface, ionosphere and atmosphere of the planet Mars. The Mars Express Orbiter spacecraft is developed operated and fully funded by ESA with the exception of the seven payload scientific instruments which will be used for remote observation of the red planet. According to the current ASI/NASA agreement the MARSIS instrument has an Italian PI, an U.S. Co-PI, and Co-I's from the Italy, the U.S. and other countries. There is also an U.S. Experiment Manager and an Italian Deputy Experiment Manager.
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