The ERS-2 satellite, launched on 21 April 1995, carried a Synthetic Aperture Radar (SAR). This provided continuity for the ERS-1 mission, which also carried a SAR instrument.
As with ERS-1, the ERS-2 SAR operated in parallel with another instrument – the Wind Scatterometer (WS). Together the SAR/WS configuration was called the Active Microwave Instrument (AMI). AMI had three modes of operation, which allowed the instruments to image land during day or night or through clouds.
The last ERS-2 SAR data were acquired on 4 July 2011 and the ERS-2 mission itself ended on 5 September 2011.