Modulation of the jovian ring current and magnetodisc due to impulsive volcanic activity on Io

Details Modulation of the jovian ring current and magnetodisc due to impulsive volcanic activity on Io Modulation of the jovian ring current and magnetodisc due to impulsive volcanic activity on Io

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm13d..01a&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM13D-01

Physics

[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2778] Magnetospheric Physics / Ring Current, [5737] Planetary Sciences: Fluid Planets / Magnetospheres, [6219] Planetary Sciences: Solar System Objects / Io

Scientific paper

Orbit-to-orbit changes in the ring/magnetodisc current system at Jupiter were inferred from Galileo magnetometer data by Russell et al. (2001) and indicated modulations of around 5 nT which lasted for less than one Galileo orbit. These observations showed both positive magnetic field perturbations, associated with compression of the magnetosphere by the solar wind, and negative perturbations associated with an increase in the mechanical stresses involved in force balance with the jxB force (Leisner et al., 2007). In this study we examine the role that impulsive volcanism on Io might play in driving the latter type of ring current modulations. Using recent UV observations of the Io plasma torus (Yoneda et al., 2010) we use an Euler potential model of the jovian magnetodisc (Achilleos et al., 2010) to quantitatively investigate changes in the ring current associated with impulsive volcanic eruptions on Io. We find (negative) magnetic field perturbations with an amplitude of around 5 nT that persist for around 10 - 15 days which is consistent with the magnetic field observations presented by Russell et al. (2001). We conclude by commenting on the possibility of impulsive events on Enceladus driving the saturnian ring current perturbations reported by Leisner et al. (2007).

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