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Article: On the effect of an electrically heterogeneous lower mantle on planetary dynamos
Title | On the effect of an electrically heterogeneous lower mantle on planetary dynamos | ||||||||||||||||
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Authors | |||||||||||||||||
Keywords | Convection Dynamos Electrically heterogeneous mantle Finite element method | ||||||||||||||||
Issue Date | 2008 | ||||||||||||||||
Publisher | Elsevier 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? | ||||||||||||||||
Abstract | Self-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 Identifier | http://hdl.handle.net/10722/58944 | ||||||||||||||||
ISSN | 2023 Impact Factor: 2.4 2023 SCImago Journal Rankings: 0.823 | ||||||||||||||||
ISI Accession Number ID |
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 Field | Value | Language |
---|---|---|
dc.contributor.author | Chan, KH | en_HK |
dc.contributor.author | Zhang, K | en_HK |
dc.contributor.author | Li, L | en_HK |
dc.contributor.author | Liao, X | en_HK |
dc.date.accessioned | 2010-05-31T03:40:07Z | - |
dc.date.available | 2010-05-31T03:40:07Z | - |
dc.date.issued | 2008 | en_HK |
dc.identifier.citation | Physics Of The Earth And Planetary Interiors, 2008, v. 169 n. 1-4, p. 204-210 | en_HK |
dc.identifier.issn | 0031-9201 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/58944 | - |
dc.description.abstract | Self-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.language | eng | en_HK |
dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/pepi | en_HK |
dc.relation.ispartof | Physics of the Earth and Planetary Interiors | en_HK |
dc.rights | Physics of The Earth and Planetary Interiors. Copyright © Elsevier BV. | en_HK |
dc.subject | Convection | en_HK |
dc.subject | Dynamos | en_HK |
dc.subject | Electrically heterogeneous mantle | en_HK |
dc.subject | Finite element method | en_HK |
dc.title | On the effect of an electrically heterogeneous lower mantle on planetary dynamos | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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+dynamos | en_HK |
dc.identifier.email | Chan, KH:mkhchan@hku.hk | en_HK |
dc.identifier.authority | Chan, KH=rp00664 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.pepi.2008.07.002 | en_HK |
dc.identifier.scopus | eid_2-s2.0-52949114525 | en_HK |
dc.identifier.hkuros | 146421 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-52949114525&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 169 | en_HK |
dc.identifier.issue | 1-4 | en_HK |
dc.identifier.spage | 204 | en_HK |
dc.identifier.epage | 210 | en_HK |
dc.identifier.isi | WOS:000260648700020 | - |
dc.publisher.place | Netherlands | en_HK |
dc.identifier.scopusauthorid | Chan, KH=7406033542 | en_HK |
dc.identifier.scopusauthorid | Zhang, K=7404451892 | en_HK |
dc.identifier.scopusauthorid | Li, L=16304446000 | en_HK |
dc.identifier.scopusauthorid | Liao, X=7202134147 | en_HK |
dc.identifier.issnl | 0031-9201 | - |