NAOC Open IR
Possible approach to detecting the mysterious Saturnian convective dynamo through gravitational sounding
Liu, Shanhong1,4; Kong, Dali2,3; Yan, Jianguo1,3
2020-12-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume644Pages:13
AbstractContext. Planetary dynamo research is mathematically and numerically difficult. Forward calculations are numerically expensive and subject to much uncertainty in key magnetohydrodynamics parameters. For a gaseous planet such as Saturn, even the precise location of its dynamo and typical convective strength are unknown, which further complicates studies.Aims. We test the idea of inversely probing Saturnian convective dynamo through gravitational sounding, based on the principle that the convective fluid motion can distort the internal density distribution and hence induce the gravitational anomaly.Methods. The Cassini Grand Finale mission has reported unprecedentedly accurate measurements of the gravitational field of Saturn. An unexplained nonaxisymmetric component of the gravitational field was detected in the data. By performing precise orbit determination (POD) simulations, we studied the possibility that the Cassini spacecraft might sense the dynamo-related nonaxisymmetric gravitational signature in the Grand Finale phase. In addition, further extensively simulated missions of various orbit configurations were carried out in order to explore promising mission strategies that might fulfill the objective of detecting the Saturnian convective dynamo.Results. Our POD simulations show that the gravity science carried out in the Cassini Grand Finale mission is insufficient to determine weak nonaxisymmetric gravitational moments because good subspacecraft-point coverage is lacking. The origin of the unexplained Saturnian gravity remains a puzzle. However, it is positively indicated by our simulations that future gravitational sounding is probably able to detect dynamo-related gravity when the subspacecraft-point coverage of a mission is sufficient. We suggest that the mission orbits be purposely designed into a near-polar orientation with a height of about 6000 km at periapsis and a moderate eccentricity of 0.5. A total POD tracking time of five months would enable the detection of the secular nonaxisymmetric gravitational moments that are caused by the deep convective dynamo of Saturn. The orbit strategy can facilitate engineering implementation by keeping the spacecraft marginally away from the Saturn radiation belt throughout the mission.
Keyworddynamo gravitation planets and satellites: gaseous planets planets and satellites: individual: Saturn planets and satellites: interiors space vehicles
Funding OrganizationB-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Macau Science and Technology Development Fund ; Macau Science and Technology Development Fund ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; National Scientific Foundation of China ; National Scientific Foundation of China ; Innovation Group of Natural Fund of Hubei province ; Innovation Group of Natural Fund of Hubei province ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Macau Science and Technology Development Fund ; Macau Science and Technology Development Fund ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; National Scientific Foundation of China ; National Scientific Foundation of China ; Innovation Group of Natural Fund of Hubei province ; Innovation Group of Natural Fund of Hubei province ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Macau Science and Technology Development Fund ; Macau Science and Technology Development Fund ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; National Scientific Foundation of China ; National Scientific Foundation of China ; Innovation Group of Natural Fund of Hubei province ; Innovation Group of Natural Fund of Hubei province ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Macau Science and Technology Development Fund ; Macau Science and Technology Development Fund ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; National Scientific Foundation of China ; National Scientific Foundation of China ; Innovation Group of Natural Fund of Hubei province ; Innovation Group of Natural Fund of Hubei province
DOI10.1051/0004-6361/202038906
WOS KeywordMAGNETIC-FIELD ; GRAVITY-FIELD ; EARTHS CORE ; ELECTRICAL-CONDUCTIVITY ; SATELLITE-OBSERVATIONS ; MODELS ; SYSTEM ; INTERIORS ; STRENGTH ; ROTATION
Language英语
Funding ProjectB-type Strategic Priority Program of the Chinese Academy of Sciences[XDB41000000] ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration[D020303] ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration[D020308] ; Macau Science and Technology Development Fund[0001/2019/A1] ; Macau Science and Technology Development Fund[0005/2019/A1] ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology[19590761300] ; National Scientific Foundation of China[U1831132] ; National Scientific Foundation of China[41374024] ; Innovation Group of Natural Fund of Hubei province[2018CFA087]
Funding OrganizationB-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Macau Science and Technology Development Fund ; Macau Science and Technology Development Fund ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; National Scientific Foundation of China ; National Scientific Foundation of China ; Innovation Group of Natural Fund of Hubei province ; Innovation Group of Natural Fund of Hubei province ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Macau Science and Technology Development Fund ; Macau Science and Technology Development Fund ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; National Scientific Foundation of China ; National Scientific Foundation of China ; Innovation Group of Natural Fund of Hubei province ; Innovation Group of Natural Fund of Hubei province ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Macau Science and Technology Development Fund ; Macau Science and Technology Development Fund ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; National Scientific Foundation of China ; National Scientific Foundation of China ; Innovation Group of Natural Fund of Hubei province ; Innovation Group of Natural Fund of Hubei province ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration ; Macau Science and Technology Development Fund ; Macau Science and Technology Development Fund ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; Hong Kong-Macau-Taiwan Cooperation Funding of Shanghai Committee of Science and Technology ; National Scientific Foundation of China ; National Scientific Foundation of China ; Innovation Group of Natural Fund of Hubei province ; Innovation Group of Natural Fund of Hubei province
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000596605000003
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/80139
Collection中国科学院国家天文台
Corresponding AuthorKong, Dali
Affiliation1.Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & R, 129 Luoyu Rd, Wuhan 430070, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Planetary Sci, 80 Nandan Rd, Shanghai 200030, Peoples R China
3.Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Taipa, Macau, Peoples R China
4.CNRS, UMR7329, Observ Cote Azur, Geoazur, F-06560 Valbonne, France
Recommended Citation
GB/T 7714
Liu, Shanhong,Kong, Dali,Yan, Jianguo. Possible approach to detecting the mysterious Saturnian convective dynamo through gravitational sounding[J]. ASTRONOMY & ASTROPHYSICS,2020,644:13.
APA Liu, Shanhong,Kong, Dali,&Yan, Jianguo.(2020).Possible approach to detecting the mysterious Saturnian convective dynamo through gravitational sounding.ASTRONOMY & ASTROPHYSICS,644,13.
MLA Liu, Shanhong,et al."Possible approach to detecting the mysterious Saturnian convective dynamo through gravitational sounding".ASTRONOMY & ASTROPHYSICS 644(2020):13.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Liu, Shanhong]'s Articles
[Kong, Dali]'s Articles
[Yan, Jianguo]'s Articles
Baidu academic
Similar articles in Baidu academic
[Liu, Shanhong]'s Articles
[Kong, Dali]'s Articles
[Yan, Jianguo]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Liu, Shanhong]'s Articles
[Kong, Dali]'s Articles
[Yan, Jianguo]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.