On a Realistic Geodynamo Model.

Abstract

The conditions for obtaining a realistic geodynamo model which accurately describes the dynamo really existing in the core of the Earth are discussed. The problem of model selection originates from the fact that the equations governing the geodynamo contain unknown parameters which should be found by fitting the geodynamo solution to available observational parameters. The system of geodynamo equations, taken from the paper by Braginsky and Roberts (1995) is provided here with short explanations. The set of unknown parameters of a geodynamo model is established. A new non-dimensional parameter is introduced which measures the relative strength of the sources driving the core convection from the “top” and from the “bottom”. Available observational parameters necessary for fitting the simulated geodynamo model to observations are discussed, particularly those which originate from the analysis of MAC-waves in the Earth core.