Abstract
AbstractThe 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.
Highlights
The Juno spacecraft has been in a highly elliptical, polar orbit about Jupiter since 4 July 2016
In strong magnetic field environments experienced near periapsis, Eddy currents are generated within electrically conductive material near the magnetic sensors
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
Summary
The Juno spacecraft has been in a highly elliptical, polar orbit about Jupiter since 4 July 2016. The Juno experience at Jupiter demonstrates that (a) the modulation is consistent across all Juno periJove passes; (b) it is independent of the instrument's dynamic range and is most readily apparent in a strong magnetic field environment, where magnetospheric fluctuations (“noise”) is insignificant; and (c) the same modulation signal is measured by both of Juno's magnetometer (IB and OB) sensors. Both sensors are accommodated on the MAG boom, within a cavity cut in the panel.
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