A new Model of Electromagnetic Magnetospheric Fields

Statistics – Computation

Scientific paper

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2712 Electric Fields (2411), 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2799 General Or Miscellaneous, 7833 Mathematical And Numerical Techniques (0500, 3200)

Scientific paper

Presentation of the electromagnetic fields in terms of the Euler potentials is ideal in modelling of the magnetic and electric fields in large-scale magnetospheric plasmas: The electric field consistent with the frozen-in condition including also the contribution arising from the temporal variations of the magnetic field can be easily obtained. Here, a recent model based on explicit Euler potentials is introduced, and the model development and related theory are outlined. The model can be used under a variety of geophysical conditions. The model configuration is determined by geometrical parameters such as the tail radius, location of the sub-solar point, and ionospheric footpoints of the cusp and the nightside plasma sheet boundary. Furthermore, input parameters such as Dst-index, location of the plasma sheet inner-edge, and the dipole tilt angle define the distribution of the magnetic flux inside the given shape of the magnetopause. In addition to these input parameters, the model uses the ionospheric convection electric field potential as a boundary condition for the magnetospheric electric field. These model aspects are designed in such away that the model can be fixed either statistically or by direct measurements for given geophysical conditions. Traditionally, magnetospheric field models only consider the magnetic field and any determination of the electric field consistent with the model magnetic field is computationally cumbersome, especially, if the resulting fields are further used, for example in test particle simulations. Thus the model provides a new tool complementing the pre-existing models in analysis, modelling, and understanding of both the electric and magnetic field measurements in the large scale, and in the test particle simulations.

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