In Pictures: NASA's hot radiation mission

NASA is set to launch its Radiation Belt Storm Probes (RBSP) to explore the most intense areas of radiation around Earth

Two giant doughnuts of plasma surround Earth, trapped within a region known as the Van Allen radiation belts. The belts lie close to Earth; satellites in geostationary orbit are above and satellites in low Earth orbit are generally below the belts. The outer radiation belt is typically about 8,400 to 36,000 miles above Earth's surface.

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