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Title: Influences on the radius of the auroral oval
Authors: Milan, Stephen E.
Hutchinson, J.
Boakes, P. D.
Hubert, B.
First Published: 2009
Publisher: European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany)
Citation: Annales Geophysicae, 2009, 27 (7), pp. 2913-2924
Abstract: 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.
DOI Link: 10.5194/angeo-27-2913-2009
ISSN: 0992-7689
eISSN: 1432-0576
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website. © European Geosciences Union 2009. Version of record: Creative Commons Attribution 3.0 License
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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