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Saturn's gravitational field Induced by its equatorially antisymmetric zonal winds
Kong, Dali1,2; Zhang, Keke2,3; Schubert, Gerald4; Anderson, John D.5
2018-05-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume18Issue:5Pages:8
Corresponding AuthorZhang, Keke(kzhang@ex.ac.uk)
AbstractThe cloud-level zonal winds of Saturn are marked by a substantial equatorially antisymmetric component with a speed of about 50ms(-1) which, if they are sufficiently deep, can produce measurable odd zonal gravitational coefficients Delta J(2k+1,) k = 1,2,3,4. This study, based on solutions of the thermal-gravitational wind equation, provides a theoretical basis for interpreting the odd gravitational coefficients of Saturn in terms of its equatorially antisymmetric zonal flow. We adopt a Saturnian model comprising an ice-rock core, a metallic dynamo region and an outer molecular envelope. We use an equatorially antisymmetric zonal flow that is parameterized, confined in the molecular envelope and satisfies the solvability condition required for the thermal-gravitational wind equation. The structure and amplitude of the zonal flow at the cloud level are chosen to be consistent with observations of Saturn. We calculate the odd zonal gravitational coefficients Delta J(2k+1,) k = 1,2,3,4 by regarding the depth of the equatorially antisymmetric winds as a parameter. It is found that Delta J(3) is -4.197 x 10(-8) if the zonal winds extend about 13 000km downward from the cloud tops while it is -0.765 x 10(-8) if the depth is about 4000 km. The depth/profile of the equatorially antisymmetric zonal winds can eventually be estimated when the high-precision measurements of the Cassini Grand Finale become available.
Keywordgravitation planets and satellites: individual (Saturn) planets and satellites: interiors
DOI10.1088/1674-4527/18/5/50
WOS KeywordGIANT PLANETS ; JUPITER ; HARMONICS ; CONVECTION ; INTERIORS ; MODEL ; DEPTH ; JETS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000432273900002
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24079
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Keke
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Planetary Sci, Shanghai 200030, Peoples R China
2.Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, Devon, England
3.Macau Univ Sci & Technol, Lunar & Planetary Sci Lab, Macau, Peoples R China
4.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA
5.Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
Recommended Citation
GB/T 7714
Kong, Dali,Zhang, Keke,Schubert, Gerald,et al. Saturn's gravitational field Induced by its equatorially antisymmetric zonal winds[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(5):8.
APA Kong, Dali,Zhang, Keke,Schubert, Gerald,&Anderson, John D..(2018).Saturn's gravitational field Induced by its equatorially antisymmetric zonal winds.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(5),8.
MLA Kong, Dali,et al."Saturn's gravitational field Induced by its equatorially antisymmetric zonal winds".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.5(2018):8.
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