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One of the most intriguing findings of the Cassini mission was the plume of water vapor and dust emanating from the moon Enceladus. This plume interacts with Saturn’s magnetospheric plasma, causing significant disturbances in the planet's magnetic field, known as the Alfven wing. This thesis employs analytical models and simulations using the hybrid code A.I.K.E.F. (Adaptive Ion-Kinetic Electron-Fluid) to investigate the processes behind these field perturbations. The findings are compared with data from the Cassini Magnetometer (MAG) during 20 flybys of Enceladus from 2005 to 2013. It reveals that electron absorption by dust results in a reversal of the Hall current, termed the "Anti-Hall effect," which has been consistently observed during all flybys. A second study integrates plasma simulations with the 3D plume profile, examining how distorted electromagnetic fields affect charged dust grains, indicating the pick-up of nanograins. Additionally, magnetic field data from the polar R2 and R3 flybys of Rhea, Saturn’s largest icy moon, are analyzed. Observations suggest Rhea is surrounded by a tenuous gas envelope, but this gas does not significantly influence the magnetic field draping pattern above its poles. Instead, the finite length of Rhea’s wake creates a diamagnetic current, producing a weak Alfven wing detected by Cassini.
Buchkauf
The plasma environments of Saturn’s moons Enceladus and Rhea, Hendrik Alexander Kriegel
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- Erscheinungsdatum
- 2014
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