Solar, Anomalous, and Magnetospheric Particle Explorer

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A US satellite launched in 1992 July to study high-energy particles from cosmic rays, solar flares, and the Earth's magnetosphere. In 1994 it detected a belt of cosmic rays trapped by the Earth's magnetic field, within the inner Van Allen Belt. It ceased operation in 2004 July.

Subjects: Astronomy and Astrophysics.

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