The European Space Agency has selected Airbus Defence and Space to begin development of Aeolus-2, the successor to the pioneering Aeolus wind-monitoring satellite that revolutionized atmospheric data collection before its mission ended in 2023. The contract marks a significant step in maintaining Europe's capability to measure global wind profiles from space, a capability that has proven essential for improving weather forecasts and climate models.
Aeolus, launched in 2018, was the first satellite to directly measure wind speeds across the Earth's surface and through the atmosphere using a powerful ultraviolet laser instrument called Aladin. The mission provided unprecedented data on wind patterns, particularly over oceans and remote regions where ground-based measurements are sparse. Its successor, Aeolus-2, will build on this legacy with enhanced technology designed to deliver even more accurate and comprehensive wind observations.
The selection of Airbus Defence and Space as the prime contractor follows a competitive procurement process managed by ESA. The company will be responsible for designing, building, and testing the satellite platform, as well as integrating the advanced lidar instrument that will measure wind speeds by analyzing the Doppler shift of laser light scattered back from particles in the atmosphere. The instrument, known as the Atmospheric Laser Doppler Instrument, represents a significant evolution from the Aladin system used on Aeolus.
ESA officials have emphasized that Aeolus-2 is critical for operational meteorology. The original Aeolus mission demonstrated that space-based wind profiling can fill crucial gaps in the global observing system, particularly for data assimilation into numerical weather prediction models. Forecasters at agencies such as the European Centre for Medium-Range Weather Forecasts have reported measurable improvements in forecast accuracy when Aeolus data were included in their models.
The new satellite is expected to be larger and more capable than its predecessor, with improved power systems and data handling to support continuous operation. While Aeolus operated in a sun-synchronous orbit at an altitude of approximately 320 kilometers, Aeolus-2 will likely operate at a similar altitude to maintain the same measurement geometry, though specific orbital parameters have not yet been finalized. The mission is planned to launch in the early 2030s, pending final approval and funding from ESA member states.
The development of Aeolus-2 also reflects lessons learned from the original mission, which faced challenges including laser degradation and orbital decay due to atmospheric drag at its relatively low altitude. Engineers have incorporated design improvements to extend the satellite's operational lifetime and ensure reliable performance over its planned multiyear mission. The satellite will also include enhanced redundancy for critical systems to mitigate the risk of single-point failures.
Beyond its immediate meteorological applications, Aeolus-2 will contribute to long-term climate monitoring by providing consistent wind data records that can be used to study atmospheric circulation patterns and their changes over time. Wind measurements are a key input for understanding energy transport in the atmosphere and for validating climate models that project future changes in weather extremes and storm tracks.
The selection of Airbus represents a continuation of the company's long involvement in ESA Earth observation missions. Airbus has previously built satellites for the Copernicus program, including the Sentinel series, and has extensive experience with lidar instruments through its work on the Aeolus mission itself. The company's facilities in France and the United Kingdom will lead the satellite construction, with contributions from subcontractors across multiple European countries.
ESA's Earth observation programs have faced budget pressures in recent years, but the agency has prioritized Aeolus-2 as a flagship mission due to its demonstrated value for operational services. The satellite is expected to be funded through ESA's Earth Observation Envelope Programme, with contributions from national space agencies. The total cost of the mission, including the satellite, instrument, launch, and operations, has not been publicly disclosed but is expected to be in the hundreds of millions of euros.
The announcement comes as the global meteorological community continues to advocate for sustained space-based wind observations. The World Meteorological Organization has identified wind profiling from space as a high-priority observation requirement, and Aeolus-2 will be a key component of the international architecture for atmospheric monitoring in the coming decades. Other space agencies, including NASA and the China National Space Administration, are also developing wind-measuring satellite missions, but Aeolus-2 remains the most advanced European effort in this domain.
With the contract now awarded, Airbus will proceed with the preliminary design phase, which is expected to last approximately 18 months. During this period, engineers will refine the satellite's specifications, conduct system-level reviews, and begin procurement of long-lead items. The subsequent detailed design and manufacturing phases will follow, leading to integration and testing before delivery for launch.