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Royal Observatory of Belgium

Royal Observatory of Belgium

38 Projects, page 1 of 8
  • Funder: European Commission Project Code: 670874
    Overall Budget: 2,500,000 EURFunder Contribution: 2,500,000 EUR

    The rotation of the Earth has long been used as a measure of time, and the stars as reference points to determine travellers’ whereabouts on the globe. Today, precise timescales are provided using atomic clocks and precise positioning is determined using geodetic techniques such as GPS grounded on two reference frames: the terrestrial frame, fixed relative to the Earth and rotating synchronously with the planet, and the celestial frame, which is immobile in space, where the artificial satellites such as those of GPS are moving. The relationship between these frames is complicated by the fact that the rotation and orientation of the Earth is subject to irregularities induced by global mass redistributions with time and external forcing such as the gravitational pull of the Sun and the Moon. With the advance of observation precision, the causes of Earth orientation changes are progressively being identified by geodesists and geophysicists. The term ‘precession’ describes the long-term trend of the orientation of the axis of spin, while ‘nutation’ is the name given to shorter-term periodic variations, which are the prime focus of the present project. The rotation axis of the Earth is moving in space at the level of 1.5km/year due to precession and has periodic variations at the level of 600 meters as seen from space in a plane tangent to the pole. The present observations allow scientists to measure these at the sub-centimetre level enabling them to identify further physics of the Earth’s interior to be taken into account in the Earth orientation models such as the coupling mechanisms at the boundary between the liquid core and the viscoelastic mantle, as well as many other factors (sometimes not yet definitely identified). The proposed research will address many of these and will result in the development of improved global orientation of the Earth with an unprecedented accuracy - at the sub-centimetre level.

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  • Funder: European Commission Project Code: 845354
    Overall Budget: 178,320 EURFunder Contribution: 178,320 EUR

    As the inner-most object of our solar system, planet Mercury is of unique relevance for e.g., solar system dynamics, planetary formation theory, and terrestrial magnetic field generation. So far, two single (NASA) space missions to Mercury have been performed. In 2018, ESA and JAXA will launch the dual-satellite BepiColombo to study Mercury from orbit with the largest and most advanced payload to date. BepiColombo’s formal objectives have been formulated prior to NASA’s latest space mission to Mercury (MESSENGER). It is now time to use MESSENGER's data return to refine our view on Mercury as support for BepiColombo’s measurement phase, starting December 2025. In this fellowship, MESSENGER data will be used to re-investigate Mercury’s interior structure, magnetic field and surface age. At the Royal Observatory of Belgium, advanced core-composition specific models on the planet’s interior will be developed. These will incorporate new experimental data on relevant metallic core-alloys which will be obtained at the High-Pressure laboratory of the VU University in Amsterdam and at synchrotron facilities. The potential of future geophysical measurements to constrain Mercury’s core composition will be the emphasize of these models. Dynamo simulations will be performed at the Max Planck Institute for Solar System Research to study Mercury’s magnetic field generation for a suite of dynamo constraints. These will improve constraints on the core’s dynamic state, which relates to the planet’s structure and core composition. Also, a new crater-counting-based surface dating method will be developed and calibrated by new models for the inner solar system’s dynamics. Applied to Mercury, this method will refine its surface age and its geological evolution and informs on the evolution and state of its mantle. Results of the above topics will be discussed in light of the measurement potential of BepiColombo and other future space missions and in light of the planet’s formation.

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  • Funder: European Commission Project Code: 855677
    Overall Budget: 4,595,080 EURFunder Contribution: 4,595,070 EUR

    To understand the processes involved in the deep interior of the Earth and explaining its evolution, in particular the dynamics of the Earth’s fluid iron-rich outer core, only indirect satellite and ground observations are available. They each provide invaluable information about the core flow but are incomplete on their own: - The time dependent magnetic field, originating mainly within the core, can be used to infer the motions of the fluid at the top of the core on decadal and subdecadal time scales. - The time dependent gravity field variations that reflect changes in the mass distribution within the Earth and at its surface occur on a broad range of time scales. Decadal and interannual variations include the signature of the flow inside the core, though they are largely dominated by surface contributions related to the global water cycle and climate-driven land ice loss. - Earth rotation changes (or variations in the length of the day) also occur on these timescales, and are largely related to the core fluid motions through exchange of angular momentum between the core and the mantle. The GRACEFUL project will go beyond the potential of individual satellite and ground observations and will combine the information about the core deduced from the gravity field, from the magnetic field and from the Earth rotation in synergy, in order to examine in unprecedented depth the dynamical processes occurring inside the core and at the core-mantle boundary. We will develop cutting-edge algorithms to process observational data and use up-to-date numerical models of the core flow to infer its dynamics. This interdisciplinary approach will challenge our current understanding of the core dynamics and provide a step change in our understanding of the deep Earth’s interior. The pioneering approach of GRACEFUL will provide an innovative template to obtain totally novel information about the dynamic processes inside the fluid core and core-mantle boundary of the Earth.

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  • Funder: European Commission Project Code: 823734
    Overall Budget: 952,200 EURFunder Contribution: 920,000 EUR
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  • Funder: European Commission Project Code: 287475
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