Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmgp11b0086j&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #GP11B-0086
Physics
1507 Core Processes (1213, 8115), 1510 Dynamo: Theories And Simulations, 6225 Mars, 8115 Core Processes (1213, 1507)
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 different Rayleigh numbers (that measures the buoyancy force relative to the Coriolis force). Our simulation results show that dynamo is still present when the Rayleigh number is reduced from approximately 30 R_c to 2.5 R_c (where R_c is the critical Rayleigh number for the onset of the purely thermal convection). This set of simulation is continuing with smaller Rayleigh numbers. A separate set of numerical simulation will be carried out in an opposite direction, with the Rayleigh number increasing from a sub-critical value to that at which a strong field dynamo can be maintained. With these two sets of simulation, we could examine the possible different geophysical conditions for the onset and annihilation of dynamo action in Mars liquid core.
Jiang Wei
Kuang Weijia
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