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Your search keyword '"Dehant, V"' showing total 38 results
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38 results on '"Dehant, V"'

1. 4. Rotation de la Terre

Author

Lambert, S., primary, Simon, J.-L., additional, Mathews, S., additional, Dehant, V., additional, and Gambis, D., additional

Published
2015
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6. Understanding a dynamic planet: Earth science requirements for geodesy

Author

Rummel, R., primary, Beutler, G., additional, Dehant, V., additional, Gross, R., additional, Ilk, K.H., additional, Plag, H.-P., additional, Poli, P., additional, Rothacher, M., additional, Stein, S., additional, Thomas, R., additional, Woodworth, P.L., additional, Zerbini, S., additional, and Zlotnicki, V., additional

Published
2009
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14. Commission 19: Earth Rotation (Rotation de la Terre)

Author

Vondrák, J., primary, McCarthy, D. D., additional, Arias, F., additional, Fumin, S. Yang, additional, Robertson, D., additional, Wilson, P., additional, Capitaine, N., additional, Manabe, S., additional, Rykhlova, L., additional, Feissel, M., additional, Dehant, V., additional, Melbourne, W., additional, Tarady, V., additional, Dickey, J. O., additional, Dickman, S., additional, Morrison, L., additional, Veillet, Ch., additional, and Kolaczek, B., additional

Published
1997
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37. Gravity, rotation, and interior of the terrestrial planets from planetary geodesy: example of Mars.

Author

Sansò, Fernando, Tregoning, Paul, Rizos, Chris, Dehant, V., and Van Hoolst, T.

Abstract

Information on planetary interiors can be obtained from planetary geodesy measurements of global parameters such as the gravity field and the rotation variations (including precession). These properties can be derived from radio science experiments in which Doppler shifts of radio signals between the Earth, planetary landers, and orbiters are measured. A radio link between the Earth and one lander on Mars has been successfully used to constrain the rotation and the precession, and consequently to obtain the moment of inertia of the planet, the global mass repartition, and its seasonal variations. A radio link between the Earth and one orbiter has also been used to determine the gravity field and its time variations. In particular, the tidal Love number k2 has been determined, from which the Martian core has been shown to be at least partially liquid. New missions that involve a space geodesy experiment addressing these topics are presented. A network of landers could probe the interior of the planet through seismic monitoring, magnetic sounding, and measurements of its rotational dynamics by radio science. This would allow the determination of the overall interior structure, including crust, mantle, and core divisions, and the state of the core (liquid/solid, density). Also composition, mineralogy, density, and temperature profiles could be inferred. Information on the interior of terrestrial planets (and large moons) other than Mars has also been determined by using radio tracking of an orbiter. For example, the tidal Love number k2 of Venus was deduced from Magellan's radio science experiment. Future missions such as Messenger and BepiColombo have dedicated onboard planetary geodesy instruments and will provide improved information on the interior of Mercury from Doppler measurements. [ABSTRACT FROM AUTHOR]

Published
2007
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38. Planetary Magnetic Dynamo Effect on Atmospheric Protection of Early Earth and Mars.

Author

Fishbaugh, Kathryn E., Lognonné, Philippe, Raulin, François, Des Marais, David J., Korablev, Oleg, Dehant, V., Lammer, H., Kulikov, Y. N., Grießmeier, J. -M., Breuer, D., Verhoeven, O., Karatekin, Ö., Van Hoolst, T., Korablev, O., and Lognonné, P.

Abstract

In light of assessing the habitability of Mars, we examine the impact of the magnetic field on the atmosphere. When there is a magnetic field, the atmosphere is protected from erosion by solar wind. The magnetic field ensures the maintenance of a dense atmosphere, necessary for liquid water to exist on the surface of Mars. We also examine the impact of the rotation of Mars on the magnetic field. When the magnetic field of Mars ceased to exist (about 4 Gyr ago), atmospheric escape induced by solar wind began. We consider scenarios which could ultimately lead to a decrease of atmospheric pressure to the presently observed value of 7 mbar: a much weaker early martian magnetic field, a late onset of the dynamo, and high erosion rates of a denser early atmosphere. [ABSTRACT FROM AUTHOR]

Published
2007
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