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ESA Vigil is a planned ESA satellite to view the Sun from Earth-Sun Lagrangian point L5, aiming for a launch in the mid-2020s, to assist in monitoring space weather through early detection of solar-activity events such as coronal mass ejections (CMEs). It would detect CMEs earlier by viewing the Sun's Earth-ward surface in profile, potentially increasing some warning times from a few minutes to a day or more.
The L5-based satellite plan is a portion of a previous larger plan called Lagrange, that additionally proposed a new satellite at L1 to view the Sun and monitor solar wind, reporting data at a more constant rate than do the current solar-monitoring satellites at L1: this would make more suitable to space-weather monitoring and prediction. The new, reduced plan intends to collaborate with a similar planned USA NOAA L1 space-weather satellite, SWFO-L1.