Study of the drift energies to localise the ring current: a comparison between the terrestrial and the kronian magnetosphere.

Details Study of the drift energies to localise the ring current: a comparison between the terrestrial and the kronian magnetosphere. Study of the drift energies to localise the ring current: a comparison between the terrestrial and the kronian magnetosphere.

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p11c1289g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P11C-1289

Physics

2721 Field-Aligned Currents And Current Systems (2409), 2756 Planetary Magnetospheres (5443, 5737, 6033), 2778 Ring Current

Scientific paper

In the Earth magnetosphere, a ring current can be observed in the dipolar region, between 2 and 9 RE. In the inner magnetosphere, the low energy particles (ions and electrons) corotate. Due to the gradient and the curvature of the field lines, the dipolar magnetic field influences the movement of the particles. Gradient and curvature are responsible of the existence of drift velocities perpendicular to the magnetic field lines. Above limit energy, the total drift velocity will be higher than the corotation velocity. Due to the orientation of the terrestrial magnetic field, the ions drift velocity is directed in an opposite direction than the corotation direction, and the electron drift velocity is directed in the same direction than the corotation direction. This explain the existence of the ring current. The same phenomenon can exist in the kronian magnetosphere. To localise this ring current it is necessary to determine the limit energy in the different part of the magnetosphere. In this paper, we will map the limit energy in the kronian magnetosphere and study the contribution of the different drift movements to this energy. Looking at the similarities and the differences between the Earth and the kronian magnetosphere, we'll present a comparative study. This work will give important information to study the kronian ring current. It also will be a start of a ring current model for the kronian magnetosphere.

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