Can Cassini magnetic field measurements be used to find the rotation period of Saturn's interior?
Can Cassini magnetic field measurements be used to find the rotation period of Saturn's interior?
复制标题
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
复制
发表时间：
2010
影响因子：
5.2
通讯作者：
J. Bloxham
中科院分区：
文献类型：
--
作者：
M. Sterenborg;J. Bloxham
我们研究了利用卡西尼号上的磁场测量来确定土星内部的自转周期。首先，我们改变旋转周期，寻找产生磁场模型与数据最小均方根不匹配的周期。其次，我们在磁场模型的非轴对称分量中寻找产生最大功率的周期。这两种方法都不能让我们确定轮换周期。然而，我们能够对土星磁场的非轴对称分量的大小进行限制，发现它不大于轴对称分量的4%-5%。
We investigate the determination of the rotation period of Saturn's interior using magnetic field measurements from Cassini. First, we vary the rotation period and search for the period that yields the smallest rms misfit of a magnetic field model to the data. Second, we search for the period that yields the most power in the non‐axisymmetric components of a magnetic field model. Neither method enables us to determine the rotation period. However, we are able to place a bound on the magnitude of the non‐axisymmetric component of Saturn's magnetic field finding it to be no greater than 4–5% of the axisymmetric component.