Investigation of the stability of the current sheet at the earth's core/mantle boundary

Details Investigation of the stability of the current sheet at the earth's core/mantle boundary Investigation of the stability of the current sheet at the earth's core/mantle boundary

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ge%26ae..27..819b&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 27, Sept.-Oct. 1987, p. 819-825. In Russian.

Computer Science

Numerical Analysis

2

Current Sheets, Earth Core, Earth Mantle, Geoelectricity, Geophysical Fluids, Magnetic Flux, Numerical Analysis, Periodic Variations

Scientific paper

The stability of the current sheet arising at the outer boundary of the earth's liquid core is studied numerically, where the sheet parameters are chosen in accordance with the Z geodynamo model. Attention is given to the plane problem which takes into account the radial field, the nonuniform azimuthal field, and strong nonuniform rotation characteristic for the Z model. Numerical results indicate the existence of an instability with a characteristic period of 100 years. It is shown that this instability may be a significant part of the mechanism for the appearance of observed short-period magnetic-field variations.

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