EPS-Sterna

The EUMETSAT Polar System – Sterna (EPS-Sterna) is a new programme fully funded by EUMETSAT that will deploy a constellation of microsatellites. Each microsatellite will carry a state-of-the-art microwave sounder designed to deliver high-quality observational data in support of operational meteorology and climate monitoring. 

The initial constellation is composed of six satellites in sun-synchronous polar orbits. In only five hours or less, the microwave sounders on these satellites will make observations covering 90% of the globe.

The microwave sounder will measure energy reflected off the Earth’s surface in the microwave range of frequencies. Because it makes measurements beyond the visible range, it can provide temperature and humidity observations even when it is overcast, raining, or snowing.

EPS-Sterna will significantly improve the accuracy of numerical weather prediction models by providing data globally with unprecedented coverage and revisit time. In addition, the mission will have a large impact over the poles, where geostationary satellites have little visibility and Metop polar-orbiting satellites need longer to achieve global coverage.