Influences on the radius of the auroral oval
We examine the variation in the radius of the auroral oval, as measured from auroral images gathered by the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft, in response to solar wind inputs measured by the Advanced Composition Explorer (ACE) spacecraft for the two year int...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2009-07-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/27/2913/2009/angeo-27-2913-2009.pdf |
| Summary: | We examine the variation in the radius of the auroral oval, as measured from
auroral images gathered by the Imager for Magnetopause-to-Aurora Global
Exploration (IMAGE) spacecraft, in response to solar wind inputs measured by
the Advanced Composition Explorer (ACE) spacecraft for the two year interval
June 2000 to May 2002. Our main finding is that the oval radius increases
when the ring current, as measured by the Sym-H index, is intensified during
geomagnetic storms. We discuss our findings within the context of the
expanding/contracting polar cap paradigm, in terms of a modification of
substorm onset conditions by the magnetic perturbation associated with the
ring current. |
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| ISSN: | 0992-7689 1432-0576 |