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Gamma Ray Spectrometer - 2001 Mars Odyssey - Lunar and Planetary Lab - The University of Arizona

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January 2008: Hydrogen Map
January 2008: Silicon Map
January 2008: Iron Map
January 2008: Chlorine Map
January 2008: Potassium Map
January 2008: Thorium Map
March 2006: Hydrogen Map
March 2006: Silicon Map
March 2006: Iron Map
March 2006: Chlorine Map
March 2006: Potassium Map
March 2006: Thorium Map
July 2004: Global Map of Martian Hydrogen
July 2004: Map of Martian Hydrogen at the North Pole
July 2004: Potassium and Thorium Tell an Interesting Story
July 2004: Watch and Listen to Seasonal Changes in Martian Polar Ice

July, 2004: Global Map of Martian Hydrogen

This gamma ray spectrometer map of the planet Mars is based on gamma rays from the element hydrogen. Regions of high hydrogen content at the north and south pole, shown in dark blue and violet, are believed to consist of very high concentrations of mostly buried water ice. In these regions, the soil is well over 50 volume percent ice, which is more like dirty ice than icy dirt. The equatorial regions of Mars are significantly drier, shown in red and yellow, than the polar regions, although two regions of moderate hydrogen concentration, shown in light blue, are centered around Arabia Terra (center of map) and around and to the east of Apollineris (left and right center of map). This hydrogen may be in the form of hydrated minerals or buried ice deposits, but the former is more likely. The locations of the five successful lander missions are marked: Viking 1 (VL1), Viking 2 (VL2), Pathfinder (PF), Spirit at Gusev (G), and Opportunity at Meridiani (M).


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