Journal
ANNALES GEOPHYSICAE
Volume 27, Issue 2, Pages 525-535Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-27-525-2009
Keywords
Magnetospheric physics; Auroral phenomena; Magnetosphere-ionosphere interactions; Storms and substorms
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Funding
- Kakioka Magnetic Observatory, Japan Meteorological Agency
- STFC
- Science and Technology Facilities Council [ST/F003005/1] Funding Source: researchfish
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This study describes the onset process of auroral substorms in connection with the vertical evolution of auroral particle acceleration, on the basis of auroral kilometric radiation (AKR) dynamics. We show that the auroral acceleration process at substorm onset basically consists of two stages: (1) appearance/intensification of a low-altitude acceleration region at 4000-5000 km accompanied by initial brightening and (2) breakout of high-altitude field-aligned acceleration above the pre-existing low-altitude acceleration region at 6000-12 000 km, which is followed by auroral breakup and poleward expansion. It is also revealed that this two-stage evolution of auroral acceleration corresponds to the two-step reinforcement of field-aligned current.
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