(ACE) Advanced Composition Explorer

The Advanced Composition Explorer (ACE) is a spacecraft that was launched by NASA in 1997 to study the solar wind and the composition of the solar wind in space. It is designed to measure the speed, density, temperature, and composition of the solar wind, and to study the plasma and energetic particles that are present in the solar wind and in the interplanetary medium. The data collected by ACE has been used to better understand the processes that drive the solar wind and the interactions between the solar wind and the Earth's magnetic field, which can impact our planet in various ways, including the generation of geomagnetic storms and auroras. The ACE spacecraft continues to operate and provide valuable scientific data to this day.