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Title:
Mars nutation resonance due to Free Inner Core Nutation
Authors:
Defraigne, P.; Rivoldini, A.; Van Hoolst, T.; Dehant, V.
Publication:
Journal of Geophysical Research, Volume 108, Issue E12, pp. 2-1, CiteID 5128, DOI 10.1029/2003JE002145 (JGRE Homepage)
Publication Date:
12/2003
Origin:
AGU
AGU Keywords:
Geodesy and Gravity: Rotational variations, Geodesy and Gravity: Planetary geodesy and gravity (5420, 5714, 6019), Planetology: Solar System Objects: Mars
DOI:
10.1029/2003JE002145
Bibliographic Code:
2003JGRE..108.5128D

Abstract

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.
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