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THEMIS Night Side Orbits
image of the aurora over the north polar region
Image credit: NASA

The THEMIS probes will line up over North America once every four days. Over the mission’s two-year lifetime, the probes should be able to observe some 30 substorms. Scientists call this orbital configuration a night side orbit because the spacecraft line up on the opposite side of the Earth from the Sun

+ View THEMIS movie illustrations
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