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Article: On the effect of an electrically heterogeneous lower mantle on planetary dynamos

TitleOn the effect of an electrically heterogeneous lower mantle on planetary dynamos
Authors
KeywordsConvection
Dynamos
Electrically heterogeneous mantle
Finite element method
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/pepi
Citation
Physics Of The Earth And Planetary Interiors, 2008, v. 169 n. 1-4, p. 204-210 How to Cite?
AbstractSelf-consistent convection-driven dynamos in an electrically conducting fluid spherical shell of constant electric conductivity surrounded by an electrically heterogeneous lower mantle are investigated using an element-by-element finite element method that takes the full advantage of modern massively parallel computers. The primary objective is to explore possible effects of an electrically heterogeneous mantle on the self-consistent convection-driven dynamos in rotating spherical systems. The dynamo solutions obtained with an electrically heterogeneous mantle are compared to that obtained with a uniformly insulating mantle at exactly the same Rayleigh, Ekman and Prandtl numbers. Three important effects are identified: (i) an electrically heterogeneous mantle can induce a vacillating dynamo whose amplitude is determined by the relative phase between the time-dependent dynamo solution and the electrically heterogeneous mantle, (ii) the spatial structure of the radial component of the generated magnetic field in the vicinity of the core-mantle boundary, an observable component of planetary magnetic fields, is strongly influenced by the structure of the electrically heterogeneous lower mantle and (iii) the extra magnetic dissipation taking place in a very thick electrically conducting layer in lower mantle can terminate dynamo action operating in the fluid core. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58944
ISSN
2015 Impact Factor: 2.605
2015 SCImago Journal Rankings: 2.140
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong RGC700308
UK PPARC
NERC
NSFC110310773022
10633030
CAS
863-project2006AA01A125
Shanghai Supercomputer Center
Funding Information:

KHC is supported by Hong Kong RGC grant/700308, KZ is supported by UK PPARC and NERC grants. LL and XL are supported by NSFC grants/110310773022/10633030, the CAS and 863-project grant/2006AA01A125. The parallel computation is supported by Shanghai Supercomputer Center.

References

 

DC FieldValueLanguage
dc.contributor.authorChan, KHen_HK
dc.contributor.authorZhang, Ken_HK
dc.contributor.authorLi, Len_HK
dc.contributor.authorLiao, Xen_HK
dc.date.accessioned2010-05-31T03:40:07Z-
dc.date.available2010-05-31T03:40:07Z-
dc.date.issued2008en_HK
dc.identifier.citationPhysics Of The Earth And Planetary Interiors, 2008, v. 169 n. 1-4, p. 204-210en_HK
dc.identifier.issn0031-9201en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58944-
dc.description.abstractSelf-consistent convection-driven dynamos in an electrically conducting fluid spherical shell of constant electric conductivity surrounded by an electrically heterogeneous lower mantle are investigated using an element-by-element finite element method that takes the full advantage of modern massively parallel computers. The primary objective is to explore possible effects of an electrically heterogeneous mantle on the self-consistent convection-driven dynamos in rotating spherical systems. The dynamo solutions obtained with an electrically heterogeneous mantle are compared to that obtained with a uniformly insulating mantle at exactly the same Rayleigh, Ekman and Prandtl numbers. Three important effects are identified: (i) an electrically heterogeneous mantle can induce a vacillating dynamo whose amplitude is determined by the relative phase between the time-dependent dynamo solution and the electrically heterogeneous mantle, (ii) the spatial structure of the radial component of the generated magnetic field in the vicinity of the core-mantle boundary, an observable component of planetary magnetic fields, is strongly influenced by the structure of the electrically heterogeneous lower mantle and (iii) the extra magnetic dissipation taking place in a very thick electrically conducting layer in lower mantle can terminate dynamo action operating in the fluid core. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/pepien_HK
dc.relation.ispartofPhysics of the Earth and Planetary Interiorsen_HK
dc.rightsPhysics of The Earth and Planetary Interiors. Copyright © Elsevier BV.en_HK
dc.subjectConvectionen_HK
dc.subjectDynamosen_HK
dc.subjectElectrically heterogeneous mantleen_HK
dc.subjectFinite element methoden_HK
dc.titleOn the effect of an electrically heterogeneous lower mantle on planetary dynamosen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0031-9201&volume=169&spage=204&epage=210&date=2008&atitle=On+the+effect+of+an+electrically+heterogeneous+lower+mantle+on+planetary+dynamosen_HK
dc.identifier.emailChan, KH:mkhchan@hku.hken_HK
dc.identifier.authorityChan, KH=rp00664en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.pepi.2008.07.002en_HK
dc.identifier.scopuseid_2-s2.0-52949114525en_HK
dc.identifier.hkuros146421en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-52949114525&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume169en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage204en_HK
dc.identifier.epage210en_HK
dc.identifier.isiWOS:000260648700020-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridChan, KH=7406033542en_HK
dc.identifier.scopusauthoridZhang, K=7404451892en_HK
dc.identifier.scopusauthoridLi, L=16304446000en_HK
dc.identifier.scopusauthoridLiao, X=7202134147en_HK

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