Systematic parameter study of dynamo bifurcations in geodynamo simulations
نویسندگان
چکیده
منابع مشابه
The effects of different parameter regimes in geodynamo simulations
Over the past 10 years, geodynamo simulations have grown rapidly in sophistication. However, it is still necessary to make certain approximations in order to maintain numerical stability. In addition, models are forced to make assumptions about poorly known parameters for the Earth’s core. Different magnetic Prandtl numbers have been used and different assumptions about the presence of radiogen...
متن کاملGeodynamo theory and simulations
80 years ago, Joseph Larmor planted the seed that grew into today’s imposing body of knowledge about how the Earth’s magnetic field is created. His simple idea, that the geomagnetic field is the result of dynamo action in the Earth’s electrically conducting, fluid core, encountered many difficulties, but these have by now been largely overcome, while alternative proposals have been found to be ...
متن کاملMagnetohydrodynamic Simulations of the Geodynamo
c © 2003 by John von Neumann Institute for Computing Permission to make digital or hard copies of portions of this work for personal or classroom use is granted provided that the copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise requires prior specific permission by the publisher ment...
متن کاملGeodynamo Simulations—how Realistic Are They?
■ Abstract The past seven years have seen significant advances in computational simulations of convection and magnetic field generation in the Earth’s core. Although dynamically self-consistent models of the geodynamo have simulated magnetic fields that appear in some ways quite similar to the geomagnetic field, none are able to run in an Earth-like parameter regime because of the considerable ...
متن کاملGeodynamo Simulations under Earth-like Conditions
A number of dynamo simulations were performed during 2005 based on a Spectral Transform Method (STM). In one series of geodynamo simulations, the Ekman (Ek) and the Rayleigh (Ra) number dependences of the dynamo action were examined in detail. The change of the pattern of the fluid motion was observed as a function of Ra at Ek = 4 × 10–5.. The dynamo simulations at the lower value of Ek = 4 × 1...
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ژورنال
عنوان ژورنال: Physics of the Earth and Planetary Interiors
سال: 2018
ISSN: 0031-9201
DOI: 10.1016/j.pepi.2018.02.001