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Interpreting the Equatorially Antisymmetric Gravitational Field of Saturn Measured by the Cassini Grand Finale
Qin, Songhe1,2; Kong, Dali1; Zhang, Keke3; Schubert, Gerald4; Huang, Yong1
2020-02-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume890Issue:1Pages:4
Corresponding AuthorKong, Dali(dkong@shao.ac.cn)
AbstractThe equatorially antisymmetric gravitational field of Saturn, represented by the four gravitational coefficients J(3), J(5), J(7), and J(9), has been measured by the Cassini Grand Finale. Since the rotational distortion and the internal structure do not contribute to the asymmetric gravity field, the spectrum of the odd coefficients offers a direct window into the structure and amplitude of fluid motion in Saturn. We show that the observed cloud-top asymmetric winds extending into Saturn's interior cannot produce the measured gravity field, suggesting that the cloud-top winds are confined within a thin weather layer and hence do not contribute to the observed gravity. We interpret the asymmetric gravitational field by searching for an a priori unknown zonal circulation taking place in the molecular envelope. We find that a zonal circulation confined in the 20,000 km thick molecular layer produces the coefficients J(3), J(5), J(7), J(9) in agreement with measurements. The depth of the circulation is consistent with that inferred from the equatorially symmetric gravitational field of Saturn.
DOI10.3847/1538-4357/ab6a9a
WOS KeywordJUPITER ; CONVECTION ; ROTATION ; JETS ; INTERIORS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000522095800026
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35806
Collection中国科学院紫金山天文台
Corresponding AuthorKong, Dali
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Planetary Sci, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Taipa, Macau, Peoples R China
4.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA
Recommended Citation
GB/T 7714
Qin, Songhe,Kong, Dali,Zhang, Keke,et al. Interpreting the Equatorially Antisymmetric Gravitational Field of Saturn Measured by the Cassini Grand Finale[J]. ASTROPHYSICAL JOURNAL,2020,890(1):4.
APA Qin, Songhe,Kong, Dali,Zhang, Keke,Schubert, Gerald,&Huang, Yong.(2020).Interpreting the Equatorially Antisymmetric Gravitational Field of Saturn Measured by the Cassini Grand Finale.ASTROPHYSICAL JOURNAL,890(1),4.
MLA Qin, Songhe,et al."Interpreting the Equatorially Antisymmetric Gravitational Field of Saturn Measured by the Cassini Grand Finale".ASTROPHYSICAL JOURNAL 890.1(2020):4.
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