Two types of expansion onsets in the Earth's two hemispheres
Abstract
On the maps of distribution of field - aligned currents (FAC) of 15 investigated substorms we have found two main types of M-I feedback instability: 1) "summer" (type 1), and 2) "winter" (type 2). In equinox both types were observed, different in the two hemispheres. Each type of instability creates two simultaneous local expansion onsets, EOs: Type 1 - non-linear amplification of the downward FAC in one hemisphere and Type 2 - non-linear amplification of the upward FAC in the other hemisphere.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFMSM51D2521F
- Keywords:
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- 2704 Auroral phenomena;
- MAGNETOSPHERIC PHYSICSDE: 2721 Field-aligned currents and current systems;
- MAGNETOSPHERIC PHYSICSDE: 2736 Magnetosphere/ionosphere interactions;
- MAGNETOSPHERIC PHYSICSDE: 2760 Plasma convection;
- MAGNETOSPHERIC PHYSICS