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| Titel |
Vertical evolution of auroral acceleration at substorm onset |
| VerfasserIn |
A. Morioka, Y. Miyoshi, F. Tsuchiya, H. Misawa, K. Yumoto, G. K. Parks, R. R. Anderson, J. D. Menietti, F. Honary |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 2 ; Nr. 27, no. 2 (2009-02-02), S.525-535 |
| Datensatznummer |
250016392
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| Publikation (Nr.) |
 copernicus.org/angeo-27-525-2009.pdf |
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| Zusammenfassung |
| 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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