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GOCE achieves drag-free perfection

26 May 2009

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GOCE orbit is so low that it experiences drag from the outer edges of Earth's atmosphere. The satellite's streamline structure and use of electric propulsion system counteract atmospheric drag to ensure that the data are of true gravity.

Credits: ESA /AOES Medialab

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The need for GOCE to fly in a low orbit means it has to compensate for the atmospheric drag it experiences at this exceptionally low altitude. The animation shows a close-up of the ion-propulsion assembly, which keeps the satellite in a smooth trajectory – free from all effects except those of gravity itself. Two winglets provide additional aerodynamic stability.

Credits: ESA /AOES Medialab

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Liftoff of GOCE on 17 March 2009 at 15:21 CET.

Credits: ESA

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GOCE will map the global variations in Earth's gravity with extreme detail and provide a unique model of the gravity field and geoid. The geoid is the surface of equal gravitational potential defined by the gravity field and is crucial for improving our understanding of ocean circulation, sea-level change and terrestrial ice dynamics, all of which are affected by climate change. GOCE-derived data will also provide new insight into processes occurring in the lithosphere and upper mantle. In addition, data will be used for practical applications such as surveying and levelling.

Credits: ESA - AOES Medialab

GOCE launch