Europe's Sentinel-3C satellite has sent back its first images and measurements just two weeks after launch, showing views of Italy, the Arctic and the Caribbean.
By Hermes-Vector AI Desk
Europe's Copernicus Sentinel-3C satellite has returned its first images and measurements from orbit, just two weeks after its launch on 15 September 2026. The third spacecraft in the Sentinel-3 series, Sentinel-3C is designed to monitor Earth's oceans, land, ice and atmosphere as part of the European Union's Copernicus Earth observation programme.
The initial images were captured by the satellite's Ocean and Land Colour Instrument (OLCI). One image, taken on 30 September 2026, stretches from southern Germany to North Africa, centering on Italy and the Mediterranean Sea. It shows the snow-covered Alps, the fertile Po Valley, and variations in water color along the Adriatic coast, which scientists attribute to sediment and phytoplankton.
Another OLCI image, also captured on 30 September, focuses on the Canadian Arctic Archipelago. It depicts snow-covered islands and fragmented sea ice in the channels between them. A third image, captured on 29 September, shows the Caribbean, highlighting the turquoise shallow waters around the Bahamas and the deeper blue of the open ocean near Cuba.
Beyond visual data, Sentinel-3C's Synthetic Aperture Radar Altimeter (SRAL) has begun measuring sea surface height and the elevation of the Greenland Ice Sheet. Between 30 September and 4 October 2026, the altimeter collected data across the Atlantic Ocean and Mediterranean Sea. According to the European Space Agency (ESA), these measurements showed good agreement with existing data from the Copernicus Marine Service, indicating the instrument is operating as expected.
The satellite also measured the surface elevation of the Greenland Ice Sheet during the same period. When compared with a reference digital elevation model, the observations closely matched existing data. This validation is critical for tracking ice sheet changes, which contribute to global sea-level rise.
ESA is currently conducting a five-month commissioning process to prepare Sentinel-3C for full operation. During this phase, the satellite is planned to operate in tandem with Sentinel-3B for about four months, followed by a three-month tandem operation with Sentinel-3A to validate measurements.
"These stunning first images show that Copernicus Sentinel-3C is performing superbly just a few weeks after launch," said Milen Tahtadjiev, Copernicus Sentinel-3 Mission Manager at EUMETSAT. "In a year of record sea-surface temperatures, an exceptional El Niño and a summer of drought and wildfires across Europe, Sentinel-3C will extend the vital record needed to track such changes, helping to save lives, protect livelihoods and strengthen economies."
Once fully operational, Sentinel-3C will contribute to global sea-level monitoring alongside missions such as Copernicus Sentinel-6 and Jason. Scientists have determined that global sea levels have increased by an average of 3.64 mm per year since 1999, with the rate of rise accelerating.
Sentinel-3C ensures the continuity of critical environmental data collected by the Sentinel-3 series since 2016. Its instruments provide near-real-time information for weather forecasting, marine pollution monitoring, and tracking climate change indicators such as sea-level rise and ice sheet melt. The satellite's data supports efforts to understand and respond to environmental changes affecting coastal communities and global ecosystems.
Sources
This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.
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