Electron pressure effects on driven auroral Alfvén waves

Details Electron pressure effects on driven auroral Alfvén waves Electron pressure effects on driven auroral Alfvén waves

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11001214v&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A1, CiteID A01214

Physics

Plasma Physics

3

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Space Plasma Physics: Kinetic And Mhd Theory

Scientific paper

Fluid models for the auroral electron acceleration processes have almost exclusively been derived by assuming cold or isothermal electrons. The consequences of these assumptions have never been thoroughly analyzed. In this study we compare results from an isothermal simulation with those obtained when the pressure is calculated from a double adiabatic approximation and from stationary kinetic theory. We find that the reflection of shear Alfvén waves, as well as the current-voltage relation, is very sensitive to the description of the electron pressure variations. Using pressures calculated from steady-state kinetic theory, we find that driven shear Alfvén waves can build up auroral currents and fields that are consistent with a linear current-voltage relation.

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