The HAWC satellite system (IMAGE) University of Toronto Caption The HAWC satellite system – which stands for High-altitude, Aerosol, Water vapour and Clouds – is Canada’s contribution to NASA’s international Atmosphere Observing System (AOS), a multi-satellite initiative designed to provide critical atmospheric measurements for climate change projections. Credit Canadian Space Agency Usage Restrictions Editorial use only with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.