This is a commentary on DOI:10.1029/2003JE002140
Mars nutation resonance due to Free Inner Core Nutation
Article first published online: 3 DEC 2003
Copyright 2003 by the American Geophysical Union.
Journal of Geophysical Research: Planets (1991–2012)
Volume 108, Issue E12, December 2003
How to Cite
2003), Mars nutation resonance due to Free Inner Core Nutation, J. Geophys. Res., 108, 5128, doi:10.1029/2003JE002145, E12., , , and (
- Issue published online: 3 DEC 2003
- Article first published online: 3 DEC 2003
- Manuscript Accepted: 8 SEP 2003
- Manuscript Revised: 29 AUG 2003
- Manuscript Received: 24 JUN 2003
- inner core;
 The rotational normal modes of the planet Mars are computed using a numerical approach. We deduce the associated resonances in the nutations induced by the external gravitational forcing from the Sun, Phobos, and Deimos. In particular, the influence of a possible solid inner core inside a liquid core is investigated. A normal mode associated with the inner core (Free Inner Core Nutation (FICN)) is computed, as well as the associated resonance effects in the nutations. For a small inner core, before the eutectic composition of the outer core is reached, the FICN effect on nutation is negligible. For a large inner core it can be very important, and for some nutations it can greatly decrease the resonance effect of the classical Free Core Nutation. Future observations of Mars nutation resonances will therefore provide information about the inner core.