Computer Science – Sound
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja......236g&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #236
Computer Science
Sound
Scientific paper
Current global interior structure models for Mars have been significantly improved. The models are derived by combining the crust models of Babeiko and Zharkov (1999) with the model Martian mantle of Bertka and Fei (1998) based on Wänke and Dreibus (1994) composition and the core model of Zharkov (1996). The geophysical parameters of Mars include planetary mass, moment of inertia, and the average radius. At present, magnesium number Mg# for the mantle, and sulfur and hydrogen content in the core, the average thickness of the crust and the temperature distribution in the crust and the mantle are reffered to main parameters varied in the models. A numerical modeling has been carried out. The martian mantle Mg# value has been ranged from 18 to 28, assuming a martian crust of 50±30 km with the temperature gradients of 2(superlow), 6(low) and 13(middle) K/km. The sulfur content was varied from 10 to 20 wt %, with the extreme cases of Fe- and FeS-core. The fact, that the martian core may contain a significant amount of hydrogen is taken into account. The presence of hydrogen in the core increases Fe/Si ratio up to 1.6 for 50 mol % of hydrogen in the core. The core radius for trial models are in the range of 1300-1800 km. Spheroidal and torsional osccilations are calculated. The difference in periods for the spheroidal fundamental tones ell;=2-3 sounding the core is about 25 %. The difference in periods for models with liquid or solid core is about 40 %. The determination of the planetary core radius with sufficiently high accuracy can substantially improve our understanding of the martian interior.
Gudkova T. V.
Zharkov Vladimir Naumovich
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