ASAR operational modes are described further in the ASAR handbook.
The ASAR acquisitions information is stored in the EOLI catalogue (the Client for browsing the catalogue can be downloaded here).
Description and Measurement Modes
The Advanced Synthetic Aperture Radar is a high resolution imaging radar. It was operated in 5 distinct Measurement Modes: Image Mode (IM), Alternating Polarisation Mode (AP), Wide Swath Mode (WS), Global Monitoring Mode (GM), and Wave Mode (WV). Within each mode, several different image swaths were used. IM, AP and WS modes were designated as High Rate (HR) modes and have a downlink rate of 100 Mbps. GM and WV were Low Rate (LR) modes and have a data generation of 0.9 Mbps.
In addition, ASAR supported 2 Auxiliary Modes (Test Mode, and Module Stepping Mode) and one Calibration Mode (External Characterization Mode) which were used for testing, calibration and instrument monitoring. Finally, one of five possible on-board data quantisation methods could have been used for each mode, although each has a default choice which will be used in most cases.
Check the ASAR Products Specification for more details.