Abstract
Radar is the acronym for RAdio Detection And Ranging. It is an object-detection system, which principles consist basically in the transmission, propagation, and reflection of radio waves. After the first exploitations in the military field, radar evolved as a useful device also in the civil field, widely extending its applications. After having been tested on Earth, radar capabilities to penetrate a planet surface have been applied on Mars exploration. MARSIS, part of the payload of ESA Mars Express mission, and SHARAD, embarked on board NASA MRO spacecraft, are two nadir-looking radar sounders which use synthetic aperture radar (SAR) techniques. The two instruments are complementary: MARSIS is able to detect subsurface interfaces at great depth, while SHARAD can better discriminate subsurface interfaces close to the surface. The two radars achieved information on Martian craters, both exposed and buried, provided geophysical evidences for the former existence of an ocean in the Martian northern hemisphere, investigated Martian pedestal craters, provided a useful contribution to analyze the nature of the Medusae Fossae Formation, and probed the ice-rich polar layered deposits of Mars, detected a boundary in many areas of plains off the south polar layered deposits. The analysis of MARSIS data enables to study also the Martian ionosphere and to estimate its TEC producing the related maps. Through volumetric (3D) study, the two radars provide an opportunity to extend our knowledge of a planetary body to the third dimension, allowing to detect features that are difficult to investigate in vertical profiles. Since Martian polar terrains are considered a close analogue to the material forming the crusts of Jovian satellites Europa and Ganymede, a radar sounder, RIME, has been selected as part of ESA’s first large-class mission in Cosmic Vision Program, JUICE, the first orbiter on an icy moon which will investigate the emergence of habitable worlds around gas giants, characterizing Ganymede, Europa, and Callisto as planetary objects and potential habitats.
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Giuppi, S. (2015). Radar Exploration of Mars: Recent Results and Progresses. In: Jin, S., Haghighipour, N., Ip, WH. (eds) Planetary Exploration and Science: Recent Results and Advances. Springer Geophysics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-45052-9_5
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