Small-scale, ``electrostatic'' auroral structures and Alfvén waves

Details Small-scale, ``electrostatic'' auroral structures and Alfvén waves Small-scale, ``electrostatic'' auroral structures and Alfvén waves

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.4411s&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A3, p. 4411-4426

Physics

45

Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Numerical Modeling

Scientific paper

The results from a numerical investigation of the influence of the plasma micro-turbulence on the structure and amplitude of macroscopic electromagnetic fields and currents inside the alfvénic field line resonance (FLR) layers are presented. Without analyzing an exact mechanism causing microturbulence, the plasma anomalous resistivity (AR) in the simplest form is included in the linear, reduced two-fluid MHD/kinetic model, developed earlier to describe dispersive alfvénic FLRs in a dipole magnetic geometry. Computations show the following: (1) A fundamental FLR forming near L=7.5 in the plasma with AR produces small-scale, intense disturbances of E⊥ at low altitudes, just above the microturbulence layer, without any significant disturbances of B⊥ with the same spatial structure. (2) Plasma AR causes a parallel electric field inside the microturbulence layer, sufficient to accelerate electrons up to 1 kV energy over a distance ~1000 km along the magnetic field line. (3) A numerical model of the alfvénic FLR, including the effect of the plasma AR even in the simplest form, reproduces the main features of the data measured by FAST satellite in the nightside auroral magnetosphere with remarkable exactness.

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