Solar wind-magnetosphere-ionosphere coupling currents in the terrestrial, jovian and kronian magnetospheres

Details Solar wind-magnetosphere-ionosphere coupling currents in the terrestrial, jovian and kronian magnetospheres Solar wind-magnetosphere-ionosphere coupling currents in the terrestrial, jovian and kronian magnetospheres

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....6469b&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #6469

Physics

Scientific paper

Planetary magnetospheres provide a natural laboratory for the study of plasma interactions and electrodynamic phenomena. While the fundamental physical processes governing magnetospheric dynamics, that is the coupling of momentum from the solar wind and planetary rotation to the plasma circulation, are not expected to vary from planet to planet, the relative importance of each will. At the Earth it is the former which plays a dominant role, and as such auroral displays which are regularly viewed at high latitudes are mainly governed by interactions with the solar wind and the interplanetary magnetic field. Magnetospheres of the outer planets are much larger than that of the Earth, and generally planetary rotation is much quicker. Hence, at Jupiter we have a contrasting situation to the Earth, a system which is dominated by the effects of rotation, though IMF effects may be important in the outer regions and in the tail. We have recently discovered that the main auroral emissions at Jupiter are formed by the inability of the magnetospheric plasma to corotate at the rapid jovian rotation rate, and we have developed theoretical models which derive the properties of the auroral primaries. This review talk will discuss the relative roles of the solar wind and planetary rotation and the parts each play in Earth's and Jupiter's environments. The latest developments of the theoretical work on the jovian system will also be presented. We will then extend this theoretical work to the kronian magnetosphere and examine whether or not the field-aligned currents associated with corotation enforcement are capable of producing the main auroral oval at Saturn, or if we expect the system to behave more like the Earth.

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