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They were the first discovery of the space age - yet half a century later, the Van Allen Belts are still a mystery. But that is about to change...
Join us as we make history operating two spacecraft in this fierce environment of the Earth's radiation belts.
Flying through these two donut-shaped regions of high-energy particles, the twin spacecraft will gather data to help us learn more about the Sun's influence in this extreme environment and understand how the variations affects work in space and life on the ground.
With these spacecraft, we will provide the key to understanding the extremes of space weather.
Buckle up for the ride that begins in 2012...