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Although ESA’s GOCE satellite is no more, all of the measurements it gathered during its life skirting the fringes our atmosphere, including the very last as it drifted slowly back to Earth, have been drawn together to offer new opportunities for science.
Carrying the first 3D gravity sensor in space, this state-of-the-art satellite measured Earth’s gravity with unprecedented accuracy.
GOCE’s four years in orbit resulted in a series of four gravity models, each more accurate than the last. These models have been used to generate corresponding ‘geoids’ – the surface of a global ocean moulded by gravity alone.
Shaped by differences in gravity, the geoid is a crucial reference for understanding ocean circulation, sea-level change and ice dynamics.
From a mission that just keeps giving, a fifth model has now been produced. It incorporates data collected throughout the satellite’s 42-month operational life.
The previous geoid, released in March 2013, was based on 27 months of measurements.
The satellite was designed to orbit at an extremely low altitude of 255 km to gain the best possible gravity measurements. At the end of 2012, low fuel consumption allowed operators to extend its life and start to lower the satellite a further 31 km for even more accurate measurements. This was at the very limit of its capability but maximised the return for science.
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In 2001, GOCE delivered a model of the 'geoid' pictured here. At the time, it was the most accurate ever produced. The colours in the image represent deviations in height (–100 m to +100 m) from an ideal geoid. The blue shades represent low values and the reds/yellows represent high values.
A precise model of Earth's geoid is essential for deriving accurate measurements of ocean circulation, sea-level change and terrestrial ice dynamics. The geoid is also used as a reference surface from which to map the topographical features on the planet. In addition, a better understanding of variations in the gravity field will lead to a deeper understanding of Earth's interior, such as the physics and dynamics associated with volcanic activity and earthquakes.
By the middle of 2014, no less than five gravity field models and corresponding geoids had been generated from GOCE's data. Each version more accurate than the last. The fifth gravity model and geoid, includes all of the gravity data collected throughout the lifetime of the mission – right up until November 2013 when the satellite finally stopped working and succumbed to the force it was designed to measure.
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Photo of GOCE reentering the atmosphere taken by Bill Chater in the Falklands at 21:20 local time on 11 November. Posted on Twitter, Bill wrote, “Driving southwards at dusk, it appeared with bright smoke trail and split in 2 before splitting again into more and going on north.”
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After more than doubling its planned life in orbit, the satellite ran out of fuel and drifted back into the atmosphere in November 2013.
The fifth gravity model and geoid, which ESA has recently made available, includes these final precious measurements, right up until the satellite finally stopped working and ironically succumbed to the force it was designed to measure.
Although the satellite is no longer in orbit, scientists now have the best possible information to hand about Earth’s gravity, effectively a new beginning for the mission.
GOCE has already shed new light on different aspects of Earth and surpassed its original scope in a number of ways.
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The Moho and lithosphere for the northeast Atlantic. Both crust and lithosphere thicken from the oceanic part beneath the Fennoscandian shield, which is a large area of rock in Scandinavia.
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It is being used to understand how oceans carry huge quantities of heat around the planet and to develop a global height reference system.
It has provided information about atmospheric density and winds, mapped the boundary between Earth’s crust and upper mantle, and used to understand what is going on in these layers far below our feet.
And its achievements include mapping a scar in Earth’s gravity caused by the 2011 Japanese earthquake.
The ultimate geoid model and gravity data will be used for years to come for a deeper understanding of Earth.
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Changes in Earth’s gravity field resulting from the earthquake that hit Japan on 11 March 2011 (mE=10-12s-2). A combination of data from ESA’s GOCE mission and the NASA–German Grace satellite, shows the ‘vertical gravity gradient change’. The 'beachball' marks the epicentre.
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ESA’s GOCE Mission Manager, Rune Floberghagen, said, “We are very happy with the results of the final, super-low altitude phase of our mission.
“In fact, efforts made by the mission team and by scientists to secure flight operations at these extreme altitudes and to process the data have resulted in a doubling of the information content and a very significant increase in spatial resolution.
“Indeed, our new ‘Release 5 solutions’ go well beyond the ambitious objectives we had when the GOCE project started.
“Scientists worldwide now have a satellite-based gravity field model at hand that will remain the de facto standard for many years to come.”
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Mapping the gravity field to advance research in Earth-interior processes, oceanography and geodesy.
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Quelle: ESA
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