Tidally Induced Core Dynamo of Mars

Details Tidally Induced Core Dynamo of Mars Tidally Induced Core Dynamo of Mars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p41a0193a&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P41A-0193

Physics

5440 Magnetic Fields And Magnetism, 5450 Orbital And Rotational Dynamics (1221), 5499 General Or Miscellaneous

Scientific paper

We study tidal excitation of elliptical instability inside the liquid core of Mars by an asteroid similar to one that created Hellas basin. The growth time of the excitation is 5,000 -20,000 years when the asteroid is at a distance of 35,000 - 50,000 km. We investigate the spin-orbit coupling of the asteroid and Mars through their tidal interaction. An captured prograde asteroid can excite the elliptical instability of the Martian core for only a few million years before colliding with Mars, whereas a captured retrograde asteroid can excite the elliptical instability for hundreds of millions of years before colliding on Mars. The tidal energy dissipation rate is over two orders of magnitude greater than the magnetic energy dissipation rate. Our results indicate that a retrograde Hellas-type asteroid is quite capable of exciting the elliptical instability in the Martian core, thus providing a candidate process to drive a core dynamo

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