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Article: A nonlinear vacillating dynamo induced by an electrically heterogeneous mantle

TitleA nonlinear vacillating dynamo induced by an electrically heterogeneous mantle
Authors
Issue Date2001
Citation
Geophysical Research Letters, 2001, v. 28 n. 23, p. 4411-4414 How to Cite?
AbstractThis paper reports the first spherical numerical dynamo based on a three-dimensional finite element method. We investigate a nonlinear dynamo in a turbulent electrically conducting fluid spherical shell of constant electric conductivity surrounded by an electrically heterogeneous mantle. Magnetic fields in the form of a three-dimensional azimuthally traveling dynamo wave are generated by a prescribed time-dependent α in the fluid shell. In the inner sphere, we assume that there is a solid electrical conductor with the same conductivity as that of the fluid shell. Equilibration of the generated magnetic fields is achieved by the nonlinear process of α-quenching. We show for the first time that finite element methods can be effectively and efficiently employed to simulate three-dimensional dynamos in spherical systems. We also show that an electrically heterogeneous mantle can modulate the core dynamo, leading to a vacillating dynamo whose amplitude depends upon the relative phases between the generated magnetic field and the heterogeneous mantle.
Persistent Identifierhttp://hdl.handle.net/10722/156087
ISSN
2015 Impact Factor: 4.212
2015 SCImago Journal Rankings: 3.323
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChan, KHen_US
dc.contributor.authorZhang, Ken_US
dc.contributor.authorZou, Jen_US
dc.contributor.authorSchubert, Gen_US
dc.date.accessioned2012-08-08T08:40:21Z-
dc.date.available2012-08-08T08:40:21Z-
dc.date.issued2001en_US
dc.identifier.citationGeophysical Research Letters, 2001, v. 28 n. 23, p. 4411-4414en_US
dc.identifier.issn0094-8276en_US
dc.identifier.urihttp://hdl.handle.net/10722/156087-
dc.description.abstractThis paper reports the first spherical numerical dynamo based on a three-dimensional finite element method. We investigate a nonlinear dynamo in a turbulent electrically conducting fluid spherical shell of constant electric conductivity surrounded by an electrically heterogeneous mantle. Magnetic fields in the form of a three-dimensional azimuthally traveling dynamo wave are generated by a prescribed time-dependent α in the fluid shell. In the inner sphere, we assume that there is a solid electrical conductor with the same conductivity as that of the fluid shell. Equilibration of the generated magnetic fields is achieved by the nonlinear process of α-quenching. We show for the first time that finite element methods can be effectively and efficiently employed to simulate three-dimensional dynamos in spherical systems. We also show that an electrically heterogeneous mantle can modulate the core dynamo, leading to a vacillating dynamo whose amplitude depends upon the relative phases between the generated magnetic field and the heterogeneous mantle.en_US
dc.languageengen_US
dc.relation.ispartofGeophysical Research Lettersen_US
dc.titleA nonlinear vacillating dynamo induced by an electrically heterogeneous mantleen_US
dc.typeArticleen_US
dc.identifier.emailChan, KH:mkhchan@hku.hken_US
dc.identifier.authorityChan, KH=rp00664en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1029/2001GL013453en_US
dc.identifier.scopuseid_2-s2.0-0035679783en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0035679783&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume28en_US
dc.identifier.issue23en_US
dc.identifier.spage4411en_US
dc.identifier.epage4414en_US
dc.identifier.isiWOS:000172425700018-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridChan, KH=7406033542en_US
dc.identifier.scopusauthoridZhang, K=7404451892en_US
dc.identifier.scopusauthoridZou, J=8389644300en_US
dc.identifier.scopusauthoridSchubert, G=7201568549en_US

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