Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2469..147l&link_type=abstract
In NASA. Marshall Space Flight Center Double Layers in Astrophysics p 147-166 (SEE N87-23313 16-88)
Astronomy and Astrophysics
Astrophysics
Auroral Arcs, Cold Plasmas, Earth Ionosphere, Earth Magnetosphere, Electric Fields, Magnetosphere-Ionosphere Coupling, Mathematical Models, Plasma Layers, Plasma Turbulence, Boundary Value Problems, Current Density, Plasma Temperature, Reaction Kinetics, Time Dependence, Wave Propagation
Scientific paper
The Earth's auroral zone contains dynamic processes occurring on scales from the length of an auroral zone field line which characterizes Alfven wave propagation to the scale of microscopic processes which occur over a few Debye lengths. These processes interact in a time-dependent fashion since the current carried by the Alfven waves can excite microscopic turbulence which can in turn provide dissipation of the Alfven wave energy. This review will first describe the dynamic aspects of auroral current structures with emphasis on consequences for models of microscopic turbulence. A number of models of microscopic turbulence will be introduced into a large-scale model of Alfven wave propagation to determine the effect of various models on the overall structure of auroral currents. In particular, the effects of a double layer electric field which scales with the plasma temperature and Debye length is compared with the effect of anomalous resistivity due to electrostatic ion cyclotron turbulence in which the electric field scales with the magnetic field strength. It is found that the double layer model is less diffusive than in the resistive model leading to the possibility of narrow, intense current structures.
Hudson Mary K.
Lysak Robert L.
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