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Definition

Galactic Cosmic Rays

GCR

High-energy charged particles originating from outside the solar system. The dominant contributor to deep-space radiation dose for crewed missions, and a significant SEU source for all space hardware.

Related terms

Geostationary OrbitGEO

A circular orbit at approximately 35,786 km altitude with zero inclination and an orbital period matching Earth's rotati...

Ground Segment

The collection of ground-based systems that support a space mission, including ground stations, mission control centers,...

G/T

A receive system figure of merit equal to antenna gain divided by system noise temperature. Larger G/T means better rece...

South Atlantic AnomalySAA

A region over the South Atlantic where the inner Van Allen radiation belt dips closest to Earth. LEO spacecraft experien...

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