Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmdi51a..05j&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #DI51A-05
Physics
5430 Interiors (8147)
Scientific paper
The remnant magnetic field observed from the Mars Global Surveyor (MSG) mission suggested that Mars possessed an active dynamo at least in its early evolution stage. However, not much is known about the physical conditions for the onset and termination of the Martian dynamo, in particular the critical energy required for maintaining the dynamo. Aiming at this problem, we use our MoSST core dynamics model to simulate Martian historical dynamo with the model parameters set except the Rayleigh number (that measures the buoyancy force relative to the Coriolis force). We run model tests in two different directions: (1) decreasing the Rayleigh number from one value at which strong field dynamo solutions are obtained from the model, to the value at which no dynamo solution could be identified in the model; (2) increasing the Rayleigh number from sub-critical values (respect to the onset of pure convection) until a strong field dynamo solution can be identified. With these sets of numerical tests, we intend to identify the minimum energy necessary to maintain the dynamo action in Mars fluid core.
Jiang Wei
Kuang Weijia
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