The effect of hyperviscosity on geodynamo models
Open Access
- 15 November 1997
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 24 (22) , 2869-2872
- https://doi.org/10.1029/97gl02955
Abstract
Some fundamental difficulties in the construction of an Earth‐like dynamo model and the role of hyperviscosity in attempting to overcome these difficulties are discussed. An Earth‐like convection model influenced by an imposed toroidal magnetic field is investigated both with and without the effect of hyperviscosity. It is shown that hyperviscosity affects the dynamics of convection significantly; the effect is similar in some respects to that of a strong magnetic field. The effective Ekman number, a key parameter for an Earthlike dynamo model, is substantially increased when hyperviscosity is employed.Keywords
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