Energetic electron lensing caused by Ganymede's magnetic field

Herceg, Matija; Jørgensen, John Leif; Merayo, José M.G.; Denver, Troelz; Jørgensen, Peter Siegbjørn; Benn, Mathias; Kotsiaros, Stavros; Connerney, J. E. P.; Bolton, S. J.

doi:10.1016/j.pss.2022.105597

Cited by 2 publications

(2 citation statements)

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“…Throughout its orbits, the μASC occasionally observes disturbances in the electron flux, primarily when traversing the M‐shell of one of the Jovian moons. Similar to the signatures observed when traversing Ganymede’s M‐shell (Herceg et al., 2022), the μASC observed Europa’s disturbances of the ambient particle population when Juno is in its M‐shell. There are nine clear μASC signatures observed during the current mission, with additional data acquired during the Europa flyby.…”

Section: Discussionsupporting

confidence: 78%

“…Attitude determination for each of the vector magnetic field sensors is provided by two pairs of collocated star camera head units (CHUs) servicing the micro Advanced Stellar Compass (μASC). In addition to its primary function as an attitude determination instrument, the μASC’s versatile design allows for a broad range of observational capabilities, including optical imaging of solar system bodies, autonomous detection and tracking of objects (Benn et al., 2017; Jørgensen et al., 2020), and detection of high‐energy particles (e.g., Becker et al., 2017; Connerney et al., 2020; Denver et al., 2024; Herceg et al., 2022; Paranicas et al., 2017; Toldbo et al., 2022). The latter is the focus of this paper.…”

Section: Introductionmentioning

confidence: 99%

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Europa's Influence on the Jovian Energetic Electron Environment as Observed by Juno's Micro Advanced Stellar Compass

Herceg,

Jørgensen,

Denver

et al. 2024

Geophysical Research Letters

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The micro Advanced Stellar Compass is an attitude reference for the MAG investigation onboard Juno. The μASC camera head unit images the star field with a CCD that is also sensitive to particles with enough energy to pass through the camera shielding: >15 MeV electrons and >80 MeV protons. This provides the capability to monitor fluxes of high‐energy particles in Jupiter’s magnetosphere. A survey of energetic electron fluxes sampled during the first 47 Juno orbits reveals instances of variations observed when Juno is traversing the M‐shell of the Galilean moons. Juno's traversal of the Europa M‐shell often results in distinctly particle signatures. We present the μASC observations of increased electron flux during the crossing of Europa’s plasma wake, and depletion of energetic electron flux on the upstream side. The upstream/downstream differences indicate that the wake environment of Europa drives strong pitch angle scattering on relativistic electrons.

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Section: Discussionsupporting

confidence: 78%