Ariane 6 places Europe’s new radar sentinel in orbit
Sentinel-1D maritime surveillance takes a step forward after Ariane 6 completed its fourth flight from Kourou. Thirty-four minutes after liftoff, the ~2-ton satellite reached a 693 km orbit. Built for the EU Copernicus program by Thales Alenia Space, it replaces Sentinel-1A (2014) and teams with Sentinel-1C. Together they restore a six-day revisit at the equator, about two days over continental Europe, and near-daily passes in the Arctic. The launcher flew with two solid boosters. After a short calibration phase, the new satellite will take on regular duties and strengthen Europe’s picture of activity at sea and on the coast.
Tracking ships and tackling “dark” activity
Sentinel-1D carries a powerful radar and an AIS antenna that reads ship signals. By comparing radar images with AIS data, it can spot “dark” ships that switch off their transponders during illegal fishing or smuggling. The radar works day and night and through cloud, with routine passes near 06:00 and 18:00 local time. This helps authorities cue patrol vessels for checks at sea or on arrival in port. Beyond security, the mission supports oil-spill detection, disaster mapping after earthquakes, and safety around ports, where ground motion can be tracked to about 0.5 cm.
The satellite’s viewing set-up improves coverage at high latitudes. It will monitor Arctic sea-ice and busy routes in northern waters every day, and watch key Antarctic zones such as Pine Island and the Thwaites Glacier. With steady timing and consistent images from Sentinel-1C and -1D, analysts gain reliable series for climate, safety, and trade. As calibration settles, Europe regains a continuous, legal, and useful service for ship tracking and polar ice watching under Copernicus.
