In 2007, NASA launched THEMIS (Time History of Events and Macroscale Interactions during Substorms), a 2-year mission to improve the understanding of how severe space weather effects on Earth.
The mission consisted of five identical probes that orbit the earth and line up over the United States every four days. In this artist's rendering, THEMIS' main orbits are represented by red ovals. Blue lines represent the Earth's magnetic field. The white flash represents energy released during substorms.
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