Cross-field transport due to low-frequency oscillations in the auroral region: A three-dimensional simulation

Details Cross-field transport due to low-frequency oscillations in the auroral region: A three-dimensional simulation Cross-field transport due to low-frequency oscillations in the auroral region: A three-dimensional simulation

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.4297g&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A3, p. 4297-4304

Physics

10

Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Plasma Waves And Instabilities, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Current Systems

Scientific paper

We have simulated the plasma transport processes in the nightside auroral region using our three-dimensional (3-D), multimoment, multifluid model. The model solves the continuity and momentum equations from 1500 km to 10 RE and allows self-consistent treatment of the cross-field transport. It has been shown that the low-frequency D'Angelo instability, driven by the transverse inhomogeneity in the magnetic-field-aligned ion flow, was excited for the typical parameters in the auroral region. The instability generates cross-field transport, which significantly modifies the field-aligned flow. The effects of cross-field transport are discussed. In the nonlinear stage of the instability, V-shaped potential structures with magnitudes ~1 kV are formed. The simulation provides insight into the dynamical evolution of the D'Angelo instability in the ionosphere-magnetosphere coupling region, its effects on plasma transport processes, and formation of 3-D potential structures.

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