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Influence of the interplanetary magnetic field on the global structure of the magnetic field and on collective processes in the magnetospheres and ionospheres of the Earth, Jupiter, and Saturn

Ziel

The main purpose of this project is to study the influence of the IMF on the magnetospheres of the Earth, Jupiter, and Saturn - all those observed during the Cassini mission. While in the Earth's magnetosphere the main energy reservoir is the solar wind, in the case of Jupiter it is the planet's rotation. The situation with regard to Saturn is not yet wholly clear, with both sources probably playing significant roles. The IMF component parallel to the Jupiter's magnetic dipole (roughly the north-south component) controls the outer magnetosphere and the rotation transfer from the ionosphere to the magnetosphere and magnetopause. A global model of the jovian magnetospheric magnetic field will be derived, which will allow mapping of the electric potential along highly-conducting field lines to any particular point of the magnetosphere and ionosphere. This model will include the jovian internal magnetic field, the field of the magnetodisc current, the field of the magnetopause currents which shield the magnetic fields of the internal magnetospheric sources, and the field of the magnetospheric tail current system including the cross-tail currents and their closure currents on the magnetopause. This global model of Jupiter's magnetosphere, developed during the course of the project, will allow us to determine the relative roles of different magnetic and electric field sources. We will compare the simulation results with observational data to select the input model parameters which provide the best representation of observations for the cases studied. The project will also relate studies of plasma micro-processes to the state of the global structure and evolution of the electromagnetic field. We intend to interpret observational data from past and forthcoming space missions by solving several mutually related theoretical problems. These problems include an analysis of the large-scale plasma dynamics with particle acceleration and transfer effects in the magnetosphere, a study of the dynamics of the plasma magnetospheric maser in the radiation belts, including complete spatio-temporal consideration of the wave spectrum, fluxes of precipitated particles and ionospheric effects, and an analysis of the interaction of suprathermal fluxes of charged particles with solitary electrostatic structures in the auroral magnetosphere. We propose to specify particle distribution functions which can be formed in the field of a single electrostatic structure for given statistics of the parameters describing the ensemble of such structures. As a result, we expect to develop a self-consistent model explaining the properties of both the electrostatic structures and the suprathermal particle fluxes, in terms of the known micro-parameters of the auroral plasma and the boundary conditions determined by the IMF, the field-aligned currents, and the ionospheric conditions at the feet of the magnetic flux tubes.

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UNIVERSITY OF LEICESTER
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University Road
LEICESTER
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Letzte Aktualisierung: 6 September 2004

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Permalink: https://cordis.europa.eu/project/id/INTAS2003-51-3922/de

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