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Depth of the dynamo region and zonal circulation of the molecular layer in Saturn inferred from its equatorially symmetric gravitational field
Kong, Dali1,2; Zhang, Keke1,3; Schubert, Gerald4
2019-10-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume488Issue:4Pages:5633-5640
Corresponding AuthorZhang, Keke(kzhang@ex.ac.uk)
AbstractThe high-precision equatorially symmetric gravitational field of Saturn (the even gravitational coefficients J(2), J(4), . . . , J(12)) measured by the Cassini Grand Finale reflects its internal structure, its non-spherical shape caused by rotation and its strong zonal circulation whose location is controlled by the depth of its dynamo. We construct a four-layer, non-spheroidal (i.e. its shape is irregular) model of Saturn comprised of an inner core, a metallic dynamo region, an outer molecular envelope and a thin transition layer between the metallic and molecular regions. The model produces the even zonal gravitational coefficients that are in agreement with those measured by the Cassini Grand Finale within the error bars. Our Saturnian model reveals that (i) the observed cloud-top winds extending to any depth on cylinders cannot explain the measured coefficients J(2), J(4), . . . , J(12); (ii) a deep zonal flow confined in the 20 000 km thick molecular layer is required to interpret them; (iii) the profile of the zonal flow-whose direction is sufficiently alternating with several retrograde peaks - significantly differs from that of the surface winds, implying that the observed winds are confined to a shallow layer, do not extend deeply into Saturn and do not contribute to the observed gravity; and (iv) the Saturnian dynamo can substantially affect the structure of its equatorially symmetric gravitational field by stopping the zonal-flow penetration and by changing, because of the boundary condition at the metallic and molecular interface, the distribution of the dynamic density anomalies.
Keyworddynamo gravitation planets and satellites: individuals: Saturn
DOI10.1093/mnras/stz2019
WOS KeywordMAGNETIC-FIELDS ; JUPITER ; CONVECTION ; INTERIORS ; MODELS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000484351300004
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27839
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Keke
Affiliation1.Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Taipa, Macao, Peoples R China
2.Shanghai Astron Observ, Key Lab Planetary Sci, Shanghai 200030, Peoples R China
3.Univ Exeter, Ctr Geophys & Astrophys Fluid Dynam, Exeter EX4 4QF, Devon, England
4.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA
Recommended Citation
GB/T 7714
Kong, Dali,Zhang, Keke,Schubert, Gerald. Depth of the dynamo region and zonal circulation of the molecular layer in Saturn inferred from its equatorially symmetric gravitational field[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,488(4):5633-5640.
APA Kong, Dali,Zhang, Keke,&Schubert, Gerald.(2019).Depth of the dynamo region and zonal circulation of the molecular layer in Saturn inferred from its equatorially symmetric gravitational field.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,488(4),5633-5640.
MLA Kong, Dali,et al."Depth of the dynamo region and zonal circulation of the molecular layer in Saturn inferred from its equatorially symmetric gravitational field".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 488.4(2019):5633-5640.
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