Crossing drones with satellites: ESA eyes high-altitude aerial platforms
28 November 2017
ESA is considering extending its activities to a new region of the sky via a novel type of aerial vehicle, a ‘missing link' between drones and satellites.
High Altitude Pseudo-Satellites, or HAPS, are platforms that float or fly at high altitude like conventional aircraft but operate more like satellites – except that rather than working from space they can remain in position inside the atmosphere for weeks or even months, offering continuous coverage of the territory below.
The best working altitude is about 20 km, above the clouds and jet streams, and 10 km above commercial airliners, where wind speeds are low enough for them to hold position for long periods.
Top story on Copernicus
13 July 2018
The Copernicus Sentinel-1 mission has revealed that, on average, Greenland's glaciers are now flowing more slowly into the Arctic Ocean.
While glacial flow may have slowed overall, in summer glaciers flow 25% faster than they do in the winter.
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