Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p31c1256d&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P31C-1256
Other
[1507] Geomagnetism And Paleomagnetism / Core Processes, [1510] Geomagnetism And Paleomagnetism / Dynamo: Theories And Simulations, [5430] Planetary Sciences: Solid Surface Planets / Interiors, [5440] Planetary Sciences: Solid Surface Planets / Magnetic Fields And Magnetism
Scientific paper
Various studies have investigated the influence of inner core conductivity in modeling planetary dynamos. Some suggest that the finite conductivity of the inner core reduces the frequency of reversals and affects magnetic field morphology while others suggest the inner core conductivity does not have a significant effect on the resulting magnetic fields. Here we investigate numerical dynamo models in Earth-like geometry in order to understand the influence of inner core conductivity. We show that a conducting inner core reduces the frequency of reversals and results in axial-dipolar dominated fields in our models and we discuss reasons for the disparities between the different models. We also test the influence of initial magnetic and velocity field on the resulting magnetic field for models with conducting and insulating inner cores. We find that initial magnetic field influences the dynamo generation mechanism but initial velocity field does not. We show that an intense planetary magnetic field does not imply that the dynamo operates in the strong field regime and we discuss the implications for magnetic field observations.
Dharmaraj G.
Stanley Sabine
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