Europlanet Science Congress 2021
Virtual meeting
13 – 24 September 2021
Europlanet Science Congress 2021
Virtual meeting
13 September – 24 September 2021
EPSC Abstracts
Vol. 15, EPSC2021-299, 2021
https://doi.org/10.5194/epsc2021-299
Europlanet Science Congress 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

The effect of Europa's perturbed electromagnetic fields and induced dipole on energetic proton depletions in the Alfvén wings

Hans Huybrighs1, Aljona Blöcker2, Elias Roussos3, Christiaan Van Buchem4, Yoshifumi Futaana5, Charlotte Goetz1, Mika Holmberg1, and Olivier Witasse1
Hans Huybrighs et al.
  • 1ESA, ESTEC, Noordwijk, Netherlands (hans.huybrighs@esa.int)
  • 2KTH, Stockholm, Sweden
  • 3Max Planck Institute for Solar System Research, Göttingen, Germany
  • 4Leiden University, Leiden, the Netherlands
  • 5Swedish Institute of Space Physics, Kiruna, Sweden

We investigate energetic proton depletions during Europa flybys E17 and E25A* by the Galileo mission. Energetic ion observations along trajectories like those of E17 & E25A are suitable for isolating the characteristics of the global configuration of the interaction region of Europa (or any Galilean moon) with the Jovian magnetosphere. Both of these flybys passed through Europa’s Alfvén wings further away from the moon, where ionospheric effects are small.

We simulate the measured flux with a Monte Carlo particle tracing code and investigate the effect of the following factors: inhomogeneous electromagnetic fields, Europa's induced dipole, atmospheric charge exchange and plumes.

We find that the homogeneous fields do not explain the Galileo data. We propose that the perturbed fields associated with the Alfvén wings affect the proton depletions. The inhomogeneous fields and induced dipole alter the pitch angle distribution of the depletion along the trajectory. The plumes that are investigated in this study have a minor effect on the proton depletions compared to the inhomogeneous fields and Alfvén wings. The contribution of atmospheric charge exchange to the depletion is negligible for these flybys. Finally, we compare the simulations to the measured proton flux and discuss the contribution of the effects we have considered.

* E25A is a segment of the Io flyby I25

How to cite: Huybrighs, H., Blöcker, A., Roussos, E., Van Buchem, C., Futaana, Y., Goetz, C., Holmberg, M., and Witasse, O.: The effect of Europa's perturbed electromagnetic fields and induced dipole on energetic proton depletions in the Alfvén wings, Europlanet Science Congress 2021, online, 13–24 Sep 2021, EPSC2021-299, https://doi.org/10.5194/epsc2021-299, 2021.

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