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Launched in November 1994, the Wind spacecraft is several years beyond its design life and well into the extended mission phase. Consequently in 2001, NASA decided that henceforth, Wind should be kept at the forward libration point to be used as a “hot spare” for the Advanced Composition Explorer (ACE) spacecraft.

Nonetheless, despite its age, Wind has proven reliable, long-lived, and highly productive, and it continues to produce solar wind magnetic field and other data of the highest quality. Thus, NASA has accepted a proposal to continue Wind operations in a cost-effective manner to ensure that data will be taken continuously and archived in level-zero and in key parameter form for use by the entire scientific community.