HR: 17:30h
AN: G42C-07    [PDF]
TI: Mars Polar motion excitation.
AU: * Dehant, V M
EM: v.dehant@oma.be
AF: Royal Observatory of Belgium, 3 avenue Circulaire, Brussels, B1180 Belgium
AU: Karatekin, O
EM: karatekin@oma.be
AF: Royal Observatory of Belgium, 3 avenue Circulaire, Brussels, B1180 Belgium
AU: de Viron, O
EM: deviron@oma.be
AF: Royal Observatory of Belgium, 3 avenue Circulaire, Brussels, B1180 Belgium
AU: van Hoolst, T
EM: vanhoolst@oma.be
AF: Royal Observatory of Belgium, 3 avenue Circulaire, Brussels, B1180 Belgium
AB: The planet Mars is ellipsoidal and has most probably a liquid outer core. The existence of a solid inner part in the core is questionable. We compute the atmospheric excitation of the Chandler Wobble and of the possible Inner Core Wobble. The atmosphere and ice caps of Mars excite these free modes. We examine whether they are excited to an observable level in future geodetic measurements of polar motion. We have developed a theoretical approach to compute polar motion in response to the excitation of atmosphere and polar caps calculated from the output of a global circulation model.
DE: 1239 Rotational variations
DE: 5450 Orbital and rotational dynamics
DE: 5724 Interiors (8147)
DE: 8147 Planetary interiors (5430, 5724)
SC: Geodesy [G]
MN: 2003 Fall Meeting