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Analysis of Eddy Current Generation on the Juno Spacecraft in Jupiter's Magnetosphere

机译:木星磁层纪念碑上的juno航天器涡流发电分析

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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.
机译:自2016年7月4日以来,Gial Giant围绕天然气巨头的朱诺代表团在天然气巨头,用专用的粒子和田间仪器对地球环境进行了示范。 Juno的磁力计调查采用一对蓬勃发展的矢量磁通磁力计,与一组星形相机一起融合,以高精度地映射木星的磁场。朱诺是一个旋转的航天器,在每分钟大约两个轮旋转。在Periapsis附近经历的强磁场环境中,在磁传感器附近的导电材料内产生涡流。这些电流对环境的测量产生不利影响,在场地幅度的自旋调制外观中最明显。我们通过有限元建模和实验室测量证明,自旋调制是由于由于导电航天器结构在存在强磁场存在下产生的涡流而导致的物理信号引起的。我们介绍了诱导场的有限元模型,并开发了一种用于去除对测量场的涡流贡献的矩阵方法。使用该型号的交互模型校正强田中的juno磁场测量。

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