auroral vortex street formed by the magnetosphere–ionosphere coupling instability
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ID: 161188
2015
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Abstract
By performing three-dimensional magnetohydrodynamic simulations including
Alfvén eigenmode perturbations most unstable to the ionospheric feedback
effects, we examined the auroral vortex street that often appears just before
substorm onset. We found that an initially placed arc splits, intensifies,
and rapidly deforms into a vortex street. We also found that there is a
critical convection electric field for growth of the Alfvén eigenmodes.
The vortex street is shown to be a consequence of coupling between the
magnetospheric Alfvén waves carrying field-aligned currents and the
ionospheric density waves driven by Pedersen/Hall currents.
| Reference Key |
hiraki2015annalesauroral
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|---|---|
| Authors | ;Y. Hiraki |
| Journal | journal of food measurement and characterization |
| Year | 2015 |
| DOI |
10.5194/angeo-33-217-2015
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| URL | |
| Keywords |
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