Glossary
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GEC
- Geospace Electrodynamic Connections
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GEO
- Geostationary orbit
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GEOSS
- Global Earth Observation System of Systems
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GIS
- geographic information systems
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GLAST
- Gamma-ray Large Area Space Telescope
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GN
- Ground Network
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GNSS
- Global Navigation Satellite Systems
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GPM
- Global Precipitation Measurement
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GPS
- global positioning system
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GRACE
- Gravity Recovery and Climate Experiment
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GSRP
- Graduate Student Researchers Program
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Geoid
- The surface within or around the earth that is everywhere perpendicular to the direction of gravity and coincides with mean sea level in the oceans at rest. Sea level of a moving ocean has topography, the topography that is measured by altimeter satellites to observe ocean currents.
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Gyre
- A great, circular motion of water in each of the major ocean basins centered on subtropical high-pressure region, with circulation clockwise in the northern hemisphere and counterclockwise in the southern hemisphere.
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galactic
- Having to do with the galaxy. A galaxy is one of billions of large systems of stars and gas, held together by gravity, that make up the universe.
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gamma rays
- A high energy photon, especially as emitted by a nucleus in a transition between two energy levels.
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geospace
- The area of space surrounding the Earth but outside of the Earth's atmosphere - influenced by the particles and fields coming from the Sun.
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geostationary
- Describes an orbit in which a satellite is always in the same position (appears stationary) with respect to the rotating Earth.
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