Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 33, issue 2
Articles | Volume 33, issue 2
https://doi.org/10.5194/angeo-33-217-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-33-217-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 33, issue 2
Regular paper
 | 
26 Feb 2015
Regular paper |  | 26 Feb 2015

Auroral vortex street formed by the magnetosphere–ionosphere coupling instability

Y. Hiraki

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Short summary
By performing 3-D MHD simulations including Alfven 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. The vortex street is shown to be a consequence of M-I coupling between field-aligned currents and Pedersen/Hall currents.
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