DOI: 10.1002/2015GL063384
论文题名: Effect of Enceladus's rapid synchronous spin on interpretation of Cassini gravity
作者: McKinnon W.B.
刊名: Geophysical Research Letters
ISSN: 0094-8798
EISSN: 1944-8529
出版年: 2015
卷: 42, 期: 7 起始页码: 2137
结束页码: 2143
语种: 英语
英文关键词: Cassini mission
; Enceladus ocean
; gravity model
; icy satellite
Scopus关键词: Hydraulics
; Shells (structures)
; Cassini mission
; Enceladus
; Floating ice
; Gravity model
; Icy satellites
; Non-hydrostatic
; Shell thickness
; Water layers
; Ice
; floating ice
; gravity wave
; hydrostatics
; satellite imagery
; water depth
英文摘要: Enceladus's degree 2 gravity, determined by Cassini, is nominally nonhydrostatic to 3σ (J2/C22 = 3.38-3.63, as opposed to 10/3). Iess et al. (2014) interpret this in terms of a hydrostatic interior (core) and isostatic (not hydrostatic) floating ice shell. Enceladus's rapid (1.37 d) synchronous spin and tide distorts its shape substantially, though, enough that the predicted hydrostatic J2/C22 is not 10/3 but closer to 3.25. This leads to the following revision to the internal picture of Enceladus, compared with Iess et al.: (1) the satellite's core is somewhat smaller and slightly denser (190 km radius and 2450 kg/m3); (2) the compensation depth (shell thickness) of the global (degree 2) ice shell is ≈ 50 km, rather close to the base of the modeled ice + water layer; and (3) the compensation depth (shell thickness) beneath the South Polar Terrain (from J3) remains shallower (thinner) at ≈ 30 km, independent of but influenced by the degree 2 solution. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84928705624&doi=10.1002%2f2015GL063384&partnerID=40&md5=f0396fd66759a3a6cc6ed1f7e4a38ff4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8414
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth and Planetary Sciences, McDonnell Center for the Space Sciences, Washington University in St. Louis, Saint Louis, MO, United States
Recommended Citation:
McKinnon W.B.. Effect of Enceladus's rapid synchronous spin on interpretation of Cassini gravity[J]. Geophysical Research Letters,2015-01-01,42(7).