Alfven Wave - DC Dualism in the Description of Stationary Field-Aligned Currents

Details Alfven Wave - DC Dualism in the Description of Stationary Field-Aligned Currents Alfven Wave - DC Dualism in the Description of Stationary Field-Aligned Currents

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13d1623k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM13D-1623

Physics

[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

The field-aligned currents (FACs) in the Earth’s magnetosphere and heliosphere may be described in terms of both DC currents and the currents of a propagating Alfven wave. The simplest example is when a propagating Alfven wave transports a potential drop along the magnetic field. In this case, the problem is well stationary between the source of the wave and its front and includes the stationary FACs, transporting the electric charges along the magnetic field, which may be described as a DC problem. At the front of the wave, however, DC approach is not applicable, and here the polarization currents are closing the electrical circuit across the magnetic field. In some space plasma scenarios, the Alfven wave approach brings better understanding of the problem. In our talk we will consider the results of the applications of this approach to two long-staying problems: the effect of saturation of the transpolar voltage in the Earth’s magnetosphere, and the experimentally-observed existence of the strong field-aligned currents in the subtle Mercury’s magnetosphere which is not able to close the measured FACs.

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