ERS-2 satellite

Like its predecessor ERS-1 (launched in July 1991 by Ariane 4), the ERS-2 satellite (launched on 21 April 1995 also by Ariane 4) monitored the ground day and night under all weather conditions thanks to its powerful sharp-eyed, cloud-piercing radars. ERS-2 also carried an instrument to help monitor the ozone layer.