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height to improve our understanding of stratospheric ozone chemistry , the interaction of composition and climate, and pollution in the upper troposphere. All measurements are made simultaneously and continuously, during both day and night. The instrument uses heterodyne radiometers that observe thermal emission from the atmospheric limb in broad spectral(More)
The Galileo spacecraft has sent back tantalizing image data hinting at a vast ocean beneath a thick ice crust on Europa, one of Jupiter's moons which is about the size of our moon. NASA plans to establish definitively whether this ocean exists with the Europa Orbiter mission to be launched in 2003. Should the Europa ocean be a reality, and this looks quite(More)
The Soil Moisture Active-Passive (SMAP) Mission is one of the first Earth observation satellites being formulated by NASA in response to the 2007 National Research Council's Decadal Survey. SMAP will make global measurements of soil moisture at the Earth's land surface and its freeze-thaw state. These measurements will allow significantly improved estimates(More)
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