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Atmospheric Composition Modeling and Analysis

Acoustic Sounders

Instruments that acquire multispectral measurements from which vertical profiles of atmospheric temperature and humidity can be derived and does particular measurements of depth of water below an instrument (at the surface or at some moored depth) which is computed form the travel time of the acoustic pulse emitted by this sounder.


Astrobiology Field Laboratory


Active Galactic Nuclei


Atmospheric InfraRed Sounder


An aneroid barometer designed to register changes in atmospheric pressure accompanying changes in altitude

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Advanced Microowave Sounding Unit


Announcement of Opportunity


Authorized Organizational Representative. NASA proposals (through NSPIRES) are not submitted by individual scientists, engineers or educators, they come from an institution (such as a university). The Authorized Organizational Representative must be an official representative of that university (for example) who has the authority to approve overhead rates in the budget, etc


the incorporation or conversion of nutrients into protoplasm that in animals follows digestion and absorption and in higher plants involves both photosynthesis and root absorption

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Metallic, rocky objects without atmospheres that orbit the Sun, but are too small to be called planets.

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Advanced Technology Initiative


The air surrounding the Earth, described as a series of shells or layers of different characteristics. The atmosphere, composed mainly of nitrogen and oxygen with traces of carbon dioxide, water vapor, and other gases, acts as a buffer between Earth and the sun. The layers, troposphere, stratosphere, mesosphere, thermosphere, and the exosphere, vary around the globe and in response to seasonal changes.

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auroral zone

The portion of the Earth that traverses the midnight portion of an oval is known as the auroral zone.

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Ames Vertical Gun Range