Saturn's internal planetary magnetic field

Saturn's internal planetary magnetic field
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土星的内部行星磁场

DOI:
10.1029/2010gl045148
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发表时间:
2010
影响因子:
5.2
通讯作者:
Burton M
Burton M
中科院分区:
地球科学1区
文献类型:
--
作者:
Burton M

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一个基于卡西尼号主要任务数据的土星内部行星磁场模型已经被推导出来。在没有确定旋转速率的情况下,模型被约束为轴对称的。我们还推导了一系列可能的行星旋转周期的非轴对称模型,并基于这些模型评估了内部磁场不对称的上限。我们研究了非轴对称磁场的最大值是否可以在特定的旋转速率下被识别出来,从而提供了对行星内部旋转速率的洞察。没有这样的峰值可以明确地识别出来。轴对称八极模型足以拟合数据,而高阶项的加入并不能提高拟合的优度。从非轴对称模型中获得的偶极子倾斜度最大值(<0.1°)证实了土星磁场的高度对称性。
A model of Saturn's internal planetary magnetic field based on data from the Cassini prime mission has been derived. In the absence of a determination of the rotation rate, the model is constrained to be axisymmetric. Non‐axisymmetric models for a range of plausible planetary rotation periods have also been derived and we evaluate upper limits on the asymmetry of the internal magnetic field based on those models. We investigate whether a maximum in the non‐axisymmetric magnetic field can be identified at a particular rotation rate thus providing insight into the rotation rate of the planet's interior. No such peak can unambiguously be identified. An axisymmetric octupole model is adequate to fit the data and addition of higher order terms does not improve the goodness of fit. The largest value of the dipole tilt obtained from non‐axisymmetric models (<0.1°) confirm the high degree of symmetry of Saturn's magnetic field.
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发表时间: 2008-09
期刊: Scopus
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卡西尼号磁场测量可以用来确定土星内部的自转周期吗?
DOI: 10.1029/2010gl043250
发表时间: 2010
影响因子: 5.2
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发表时间: 2010
影响因子: 8.7
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