The Juno mission to Jupiter, in polar orbit around the gas giant since 4 July 2016, samples the planet's environment with dedicated particle and fields instruments. Juno's magnetometer investigation employs a pair of boom‐mounted vector fluxgate magnetometers colocated with a set of star cameras to map Jupiter's magnetic field with high accuracy. Juno is a spinning spacecraft, rotating at approximately two rotations per minute. In strong magnetic field environments experienced near periapsis, Eddy currents are generated within electrically conductive material near the magnetic sensors. These currents adversely affect measurements of the environment, most evident in the appearance of a spin modulation in the field magnitude. We demonstrate, by finite element modeling and laboratory measurements, that the spin modulation is caused by a physical signal due to Eddy currents generated by the rotation of the conductive spacecraft structure in the presence of a strong magnetic field. We present a finite element model of the induced field and develop a matrix method for removing the Eddy current contribution to the measured field. Juno magnetic field measurements in strong fields are corrected for Eddy current contributions using this model of the interaction.

中文翻译：

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木星磁层朱诺航天器涡流产生分析

自2016年7月4日起，朱诺号对木星的探测任务一直围绕着这颗天然气巨行星进行极地轨道运行，它使用专用的粒子和场仪器对地球环境进行采样。Juno的磁力计研究使用了一对吊杆安装的矢量磁通门磁力计，它们与一组星形摄像机并置在一起，以高精度绘制木星的磁场。朱诺（Juno）是旋转的航天器，每分钟大约旋转两圈。在接近根尖周围的强磁场环境中，在磁传感器附近的导电材料内会产生涡流。这些电流会对环境的测量产生不利影响，最明显的表现是场强的自旋调制。我们通过有限元建模和实验室测量证明 认为自旋调制是由物理信号引起的，该物理信号是由导电航天器结构在强磁场存在下旋转产生的涡流引起的。我们提出了一个感应场的有限元模型，并开发了一种消除涡流对被测场贡献的矩阵方法。使用这种相互作用模型，可以对强磁场中的朱诺磁场测量值进行涡流贡献校正。