|
|
GOCE giving new insights into Earth’s gravity 
The first global gravity model based on GOCE satellite data has been presented at ESA’s Living Planet Symposium. ESA launched GOCE in March 2009 to map Earth's gravity with unprecedented accuracy and resolution. The model, based on only two months of data, from November and December 2009, shows the excellent capability of the satellite to map tiny variations in Earth’s gravity. "GOCE is delivering where it promised: in the fine spatial scales," GOCE Mission Manager Rune Floberghagen said. "We have already been able to identify significant improvements in the high-resolution 'geoid', and the gravity model will improve as more data become available."
The geoid is the shape of an imaginary global ocean dictated by gravity in the absence of tides and currents. It is a crucial reference for accurately measuring ocean circulation, sea-level change and ice dynamics – all affected by climate change.
"Over continents, and in particular in regions poorly mapped with terrestrial or airborne techniques, we can already conclude that GOCE is changing our understanding of the gravity field," Dr Floberghagen added.
"Over major parts of the oceans, the situation is even clearer, as the marine gravity field at high spatial resolution is for the first time independently determined by an instrument of such quality."
"With each two-month cycle of data, the gravity model will become more detailed and accurate. I am convinced that the data will be of great interest to various disciplines of Earth sciences," Prof. Rummel said.
Excellent technical achievement In order to achieve its very challenging mission objectives, the satellite was designed to orbit at a very low altitude, where the gravitational variations are stronger closer to Earth.
Since mid-September 2009, GOCE has been in its gravity-mapping orbit at a mere 254.9 km mean altitude – the lowest orbit sustained over a long period by any Earth observation satellite.
It ensures the gravity sensors are flying as though they are in pure freefall, so they pick up only gravity readings and not the disturbing effects from other forces. To obtain clean gravity readings, there can be no disturbances from moving parts, so the entire satellite is a single extremely sensitive measuring device. "The gravity measuring system is functioning extremely well. The system is actively compensating for the effects of atmospheric drag and delivering a continuous set of clean gravity readings," Dr Floberghagen said. "This in itself is an excellent technical achievement. GOCE has proven to be a nearly perfect satellite for measuring gravity from space."
In May, ESA made available the first set of gravity gradients and 'high-low satellite-to-satellite tracking'. These data are available to scientific and non-commercial users – and much more will come in the following months.
| ||||||||||||||||||||||||||||||||||||||||||||||
