Saturn’s thermal emission at 2.2-cm wavelength as imaged by the Cassini RADAR radiometer

•Five years worth of high-resolution maps of Saturn at 2.2-cm λ are presented.•They show variations in both cloud and sub-cloud ammonia concentration.•They reveal features never before seen, or viewed in a way never before possible.•Comparison indicates a remarkable degree of stability in most regions.•Future multi-wavelength comparisons can address circulations in a new way.