A model for the reflection of Alfvén waves at the source region of the Birkeland current system: The tau generator

Details A model for the reflection of Alfvén waves at the source region of the Birkeland current system: The tau generator A model for the reflection of Alfvén waves at the source region of the Birkeland current system: The tau generator

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104..269v&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A1, p. 269-278

Physics

14

Magnetospheric Physics: Current Systems, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Plasma Convection

Scientific paper

The source region of the Birkeland current system, also called the generator of the auroral current circuit, is probably located in the outer equatorial magnetosphere on closed magnetic field lines. Alfvén waves have often been suggested as carriers for field-aligned currents, momentum, and electromagnetic energy which is converted to particle kinetic energy and ohmic heat at the polar end of the auroral flux tubes. In this report we present a model for the interaction of Alfvén waves with the plasma in the generator region: the tau generator. We show that existing concepts like current and voltage generators correspond to extreme values of the intrinsic parameter τ. A frequency dependent reflection coefficient can be found which has considerable effect on the evolution of magnetospheric oscillations. Furthermore, we discuss the physical significance of the parameter τ and relate it to some measure for the effective height of the generator region.

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