Geophysicists will be able to answer these questions in the future using
gravity field measurements from ESA's GOCE gravity satellite.
«With
the gravity field measurements we can provide additional information to the plate tectonic model as we can draw conclusions regarding density and thickness of the different plates,» says Bouman.
«Gravity glasses offer a view of the Earth's interior: Data grid for GOCE
gravity field measurements sheds new light on the Earth's structure.»
«Juno's
gravity field measurements differ significantly from what we expected, which has implications for the distribution of heavy elements in the interior, including the existence and mass of Jupiter's core,» Bolton said.
Not exact matches
Thanks to Swarm's precise
measurements along with those from Champ — a mission that ended in 2010 after measuring Earth's
gravity and magnetic
fields for more than 10 years — scientists have not only been able to find the magnetic
field generated by ocean tides but, remarkably, they have used this new information to image the electrical nature of Earth's upper mantle 250 km below the ocean floor.
Two of them will be part of the GRAIL mission — the
Gravity Recovery and Interior Laboratory — now starting to make extremely precise
measurements of the lunar gravitational
field.
But there is reason to suspect that gravitational energy is a special case, that
measurements of sufficient accuracy might expose a violation of the equivalence principle when energy is stored in a
gravity field.
Engineers and scientists will also refine their
measurements of Ceres»
gravity field, which will help mission planners in designing Dawn's next orbit — its lowest — as well as the journey to get there.
More surprises came from preliminary
measurements of Jupiter's gravitational
field (that is, the strength and direction of the planet's
gravity at different points in space).
Measurements made before and after the quake show subtle changes in the local
gravity field, the European Space Agency said last week.
Now, using gravitometers and magnetometers, which measure fluctuations in
gravity and magnetic
fields, as well as deep - earth
measurements from seismometers embedded in the ice, Bell is closing in on answers.
«Magnetic
fields are one of the keys to understand the sub-surface of the planet, in combination with other pieces of information such as
gravity and seismic
measurements,» said Dr Rune Floberghagen, Esa's Swarm mission manager.
Historically,
measurements of our solar system's
gravity created by our sun have been used to try and detect the fifth force, but that has proven difficult because its gravitational
field is relatively weak.
Bolton says that data, coupled with
measurements of the planet's
gravity field, differing from projections points toward a planet whose interior has more complexity and motion than anyone would have expected.
«Juno's
measurement of Jupiter's
gravity field indicates a surprising north - south asymmetry, similar to the asymmetry observed in its zones and belts,» said Luciano Iess, Juno co-investigator from Sapienza University of Rome.
These
measurements provide clues to the structure of Jupiter's interior and how the
gravity field varies with depth: the bigger the
gravity signal, the stronger the flow of gas deep within Jupiter.