Wind

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Wind is a spin-stabilized spacecraft that observes the solar wind that is about to impact the magnetosphere of Earth. The Wind spacecraft is the first of two U.S. missions of the Global Geospace Science (GGS) initiative, which is part of a worldwide collaboration called the International Solar-Terrestrial Physics (ISTP) program. The aim of ISTP is to understand the physical behavior of the solar-terrestrial system in order to predict how the Earth's magnetosphere and atmosphere will respond to changes in solar wind.