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

S. Kotsiaros*, J. E.P. Connerney, Y. M. Martos

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    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.

    Original languageEnglish
    Article numbere2019EA001061
    JournalEarth and Space Science
    Volume7
    Issue number7
    Number of pages10
    ISSN2333-5084
    DOIs
    Publication statusPublished - 2020

    Keywords

    • Eddy currents
    • Fluxgate magnetometers
    • Juno
    • Jupiter
    • Magnetic cleanliness
    • Spacecraft generated fields

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