Differential Rotation in Jupiter's Interior Revealed by Simultaneous Inversion for the Magnetic Field and Zonal Flux Velocity
Differential Rotation in Jupiter's Interior Revealed by Simultaneous Inversion for the Magnetic Field and Zonal Flux Velocity
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磁场和纬向通量速度的同时反演揭示了木星内部的差分旋转
DOI：
10.1029/2021je007138
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
S. Bolton
中科院分区：
文献类型：
--
作者：
J. Bloxham;K. Moore;L. Kulowski;H. Cao;R. Yadav;D. Stevenson;J. Connerney;S. Bolton
当前朱诺号任务（Bolton et al., 2017, https://doi.org/10.1126/science.aal2108）的一个关键目标是直接确定木星内部磁场的长期变化（时间依赖性），以进一步了解木星内部的动力学。在这里，我们发现磁场的静态基线模型的残差与长期变化的影响一致，特别是由磁场的纬向漂移引起的长期变化。我们提出了一种同时反演主磁场和由于场的纬向漂移引起的长期变化的技术。我们系统地探索了所需的漂移，并认为虽然漂移主要由顺向超级旋转主导，相对于系统 IIIa (1965) 大约相当于 106 分之一，但也有证据表明场的差分漂移。我们将由此产生的长期变化与 Moore 等人确定的结果进行比较。 （2019，https://doi.org/10.1038/s41550-019-0772-5）和康纳尼等人。 （2022，https://doi.org/10.1029/2021je007055）并找到良好的一致性。这表明木星磁场的漂移率在几十年的时间段内是稳定的，尽管短期长期变化（例如由扭转振荡引起的）叠加在这种稳定的长期变化上仍然是可能的。
A key objective of the current Juno mission (Bolton et al., 2017, https://doi.org/10.1126/science.aal2108) is the direct determination of the secular variation (time dependency) of Jupiter's internal magnetic field in order to further understand the dynamics of Jupiter's interior. Here, we find that the residuals to a static, baseline model of the magnetic field are consistent with the effects of secular variation, specifically secular variation arising from zonal drift of the field. We present a technique for simultaneously inverting for the main magnetic field and secular variation due to zonal drift of the field. We explore the required drift systematically and argue that although the drift is dominated by a prograde super‐rotation, corresponding to approximately 1 part in 106 relative to System IIIa (1965), there is also evidence for differential drift of the field. We compare the resultant secular variation with that determined by Moore et al. (2019, https://doi.org/10.1038/s41550-019-0772-5) and Connerney et al. (2022, https://doi.org/10.1029/2021je007055) and find good agreement. This suggests that the drift rate of Jupiter's magnetic field is steady over time periods of several decades, though short period secular variation (such as that resulting from torsional oscillations) superimposed on this steady secular variation is still possible.
影响因子：
8.7
作者：
French, Martin;Becker, Andreas;Redmer, Ronald
通讯作者：
Redmer, Ronald
影响因子：
5.3
作者：
Hori K
通讯作者：
Hori K