On 28 August 2025, the Multi-Viewing, Multi-Channel, Multi-Polarisation Imager (3MI), carried aboard the Metop-SGA1 satellite operated by EUMETSAT, began capturing its first images. 3MI is Europe’s first operational polarimeter in orbit, designed to improve the monitoring of aerosols, smoke, dust, and cloud properties.
The initial data has already demonstrated the instrument’s capability. Images revealed smoke plumes from wildfires in Southern Europe and cloud features with a level of detail that is not visible with traditional instruments. One observation showed a cloud bow, similar to a rainbow, over the coasts of Chile and Peru. This phenomenon was only visible through 3MI’s use of polarised light measurements.
By combining multiple viewing angles, a wide range of spectral channels, and polarisation, 3MI provides information on particle size, composition, and distribution in the atmosphere. This data will contribute to improved weather forecasts, air quality monitoring, and climate studies.
EUMETSAT reported that these first images confirm the instrument is performing as expected and will be integrated into operational data streams after further calibration and validation. The availability of polarimetric data marks a step forward in the capacity to monitor pollution, smoke, and cloud properties from space.
The images and further details were published by EUMETSAT and can be accessed at: https://www.eumetsat.int/groundbreaking-new-sensor-transforms-how-europe-tracks-pollution-smoke-and-cloud-space
