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Article: Planetary dynamos: Effects of electrically conducting flows overlying turbulent regions of magnetic field generation

TitlePlanetary dynamos: Effects of electrically conducting flows overlying turbulent regions of magnetic field generation
Authors
KeywordsGeophysics
Magnetic Fields
Issue Date2004
PublisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/icarus
Citation
Icarus, 2004, v. 172 n. 2, p. 305-315 How to Cite?
AbstractA fully three-dimensional, nonlinear, time-dependent, multi-layered spherical kinematic dynamo model is used to study the effect on the observable external magnetic field of flow in an electrically conducting layer above a spherical turbulent dynamo region in which the α effect generates the magnetic field. It is shown that the amplitude and structure of an observable planetary magnetic field are largely determined by the magnitude and structure of the flow in the overlying layer. It is also shown that a strong-field planetary dynamo can be readily produced by the effect of an electrically conducting flow layer at the top of a convective core. The overlying layer and the underlying convective region constitute a magnetically strongly coupled system. Such overlying layers might exist at the top of the Earth's core due to chemical or thermal causes, in the cores of other terrestrial planets for similar reasons, and in Saturn due to the differentiation of helium from hydrogen. An electrically conducting and differentially rotating layer could exist above the metallic hydrogen region in Jupiter and affect the jovian magnetic field similar to the overlying layers in other planets. Lateral temperature gradients resulting in thermal winds drive the flow in the overlying layers. All planetary magnetic fields could be maintained by similar turbulent convective dynamos in the field-generation regions of planets with the differences among observable magnetic fields due to different circulations in the overlying electrically conducting layers. © 2004 Elsevier Inc. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/156122
ISSN
2015 Impact Factor: 3.383
2015 SCImago Journal Rankings: 2.447
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSchubert, Gen_US
dc.contributor.authorChan, KHen_US
dc.contributor.authorLiao, Xen_US
dc.contributor.authorZhang, Ken_US
dc.date.accessioned2012-08-08T08:40:29Z-
dc.date.available2012-08-08T08:40:29Z-
dc.date.issued2004en_US
dc.identifier.citationIcarus, 2004, v. 172 n. 2, p. 305-315en_US
dc.identifier.issn0019-1035en_US
dc.identifier.urihttp://hdl.handle.net/10722/156122-
dc.description.abstractA fully three-dimensional, nonlinear, time-dependent, multi-layered spherical kinematic dynamo model is used to study the effect on the observable external magnetic field of flow in an electrically conducting layer above a spherical turbulent dynamo region in which the α effect generates the magnetic field. It is shown that the amplitude and structure of an observable planetary magnetic field are largely determined by the magnitude and structure of the flow in the overlying layer. It is also shown that a strong-field planetary dynamo can be readily produced by the effect of an electrically conducting flow layer at the top of a convective core. The overlying layer and the underlying convective region constitute a magnetically strongly coupled system. Such overlying layers might exist at the top of the Earth's core due to chemical or thermal causes, in the cores of other terrestrial planets for similar reasons, and in Saturn due to the differentiation of helium from hydrogen. An electrically conducting and differentially rotating layer could exist above the metallic hydrogen region in Jupiter and affect the jovian magnetic field similar to the overlying layers in other planets. Lateral temperature gradients resulting in thermal winds drive the flow in the overlying layers. All planetary magnetic fields could be maintained by similar turbulent convective dynamos in the field-generation regions of planets with the differences among observable magnetic fields due to different circulations in the overlying electrically conducting layers. © 2004 Elsevier Inc. All rights reserved.en_US
dc.languageengen_US
dc.publisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/icarusen_US
dc.relation.ispartofIcarusen_US
dc.subjectGeophysicsen_US
dc.subjectMagnetic Fieldsen_US
dc.titlePlanetary dynamos: Effects of electrically conducting flows overlying turbulent regions of magnetic field generationen_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.doi10.1016/j.icarus.2004.06.007en_US
dc.identifier.scopuseid_2-s2.0-11144347088en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-11144347088&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume172en_US
dc.identifier.issue2en_US
dc.identifier.spage305en_US
dc.identifier.epage315en_US
dc.identifier.isiWOS:000225910300001-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridSchubert, G=7201568549en_US
dc.identifier.scopusauthoridChan, KH=7406033542en_US
dc.identifier.scopusauthoridLiao, X=7202134147en_US
dc.identifier.scopusauthoridZhang, K=7404451892en_US
dc.identifier.citeulike10337702-

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