Variation of the Dynamo region and sudden termination of Mars Dynamo

Details Variation of the Dynamo region and sudden termination of Mars Dynamo Variation of the Dynamo region and sudden termination of Mars Dynamo

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmgp23a..07k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #GP23A-07

Physics

1213 Earth'S Interior: Dynamics (1507, 7207, 7208, 8115, 8120), 1510 Dynamo: Theories And Simulations, 4255 Numerical Modeling (0545, 0560), 5430 Interiors (8147), 5440 Magnetic Fields And Magnetism

Scientific paper

Numerical simulation showed that the Mars dynamo could be subcritical towards the end of it history: as the Rayleigh number (measuring the driving force of the dynamo) decreases from the strong-field dynamo domain, the numerical Mars magnetic field remains comparable in magnitude. It vanishes suddenly when the Rayleigh number is lower than a critical value. However, the Mars dynamo will not be reactivated until the Rayleigh number increases to a value much higher than the critical point for the termination of the dynamo. To better understand the termination of the Mars dynamo, it is important to understand first the variation of the dynamo region in which the emf offsets the Joule dissipation. Our initial analysis shows that the dynamo region is often around the tangent cylinder (a co-axial cylindrical surface across the outer core tangent to the inner core boundary at the equator) and extended outward significantly. As the Rayleigh number decreases, the dimension of the region is reduced, and tends to fluctuate stronger in time. These two combined may suggest that there is probably a critical dimension, below which the dynamo region can no longer be sustained by core convection.

Affiliated with

Also associated with

No associations

Rating

Variation of the Dynamo region and sudden termination of Mars Dynamo does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Variation of the Dynamo region and sudden termination of Mars Dynamo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variation of the Dynamo region and sudden termination of Mars Dynamo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1410026