Feedback instability in the magnetosphere-ionosphere coupling system: Revisited
- National Institute for Fusion Science/Graduate University for Advanced Studies, Toki, Gifu, 509-5292 (Japan)
A coupled set of the reduced magnetohydrodynamic and the two-fluid equations is applied to the magnetosphere-ionosphere (M-I) feedback interactions in relation to growth of quite auroral arcs. A theoretical analysis revisiting the linear feedback instability reveals asymptotic behaviors of the dispersion relation and a non-Hermite property in the M-I coupling. A nonlinear simulation of the feedback instability in the M-I coupling system manifests growth of the Kelvin-Helmholtz-like mode in the magnetosphere as the secondary instability. The distorted vortex and field-aligned current profiles propagating as the shear Alfven waves lead to spontaneous deformation of ionospheric density and current structures associated with auroral arcs.
- OSTI ID:
- 21347129
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 17; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
COUPLING
DISPERSION RELATIONS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
FEEDBACK
FLUID MECHANICS
HYDRODYNAMICS
HYDROMAGNETIC WAVES
INSTABILITY
IONOSPHERE
MAGNETOHYDRODYNAMICS
MECHANICS
NONLINEAR PROBLEMS
PLASMA DENSITY
PLASMA INSTABILITY
PLASMA SIMULATION
SIMULATION
ALFVEN WAVES
COUPLING
DISPERSION RELATIONS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
FEEDBACK
FLUID MECHANICS
HYDRODYNAMICS
HYDROMAGNETIC WAVES
INSTABILITY
IONOSPHERE
MAGNETOHYDRODYNAMICS
MECHANICS
NONLINEAR PROBLEMS
PLASMA DENSITY
PLASMA INSTABILITY
PLASMA SIMULATION
SIMULATION