Effect of an inner core on Mars' polar motion and nutation

Details Effect of an inner core on Mars' polar motion and nutation Effect of an inner core on Mars' polar motion and nutation

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p42a0552d&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P42A-0552

Physics

5430 Interiors (8147)

Scientific paper

Mars' core is believed to be presently completely liquid. Though the presence of an inner core is not excluded. The existence of an inner core would induce a wobble of the planet which, if excited, could be seen in polar motion, i.e. in the motion of the instantaneous rotation axis in a frame tied to the planet. In this paper, we examine the consequences of an atmospheric excitation of that mode and of the classical Chandler wobble. The presence of an inner core induces also a free inner core nutation and consequently a resonance in the nutations of the planet. These nutations will be observed by the future experiment NEIGE (NEtlander Ionosphere and Geodesy Experiment). We will therefore compute the potential effect of an inner core on these observations.

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