The European Space Agency ESA launched the Earth Explorer Mission Aeolus on 22 August 2018. This mission aims to demonstrate the significant improvement in weather forecasting by measuring height-resolved wind profiles in the troposphere and lower stratosphere. The instrument ALADIN (Atmospheric Laser Doppler Instrument) will be the first Lidar (Light Detection and Ranging) instrument on a European satellite. It is also the first instrument in space capable of measuring vertical profiles of wind speed on a global basis. The aim of EVAA is to validate the wind and aerosol products of Aeolus and to quantify the benefits of these new measurements for weather forecasting by assimilation experiments.