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| Titel |
Superposed epoch analysis of the ionospheric convection evolution during substorms: onset latitude dependence |
| VerfasserIn |
A. Grocott, J. A. Wild, S. E. Milan, T. K. Yeoman |
| 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 (2009-02-06), S.591-600 |
| Datensatznummer |
250016398
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| Publikation (Nr.) |
 copernicus.org/angeo-27-591-2009.pdf |
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| Zusammenfassung |
| Using data from the Super Dual Auroral Radar Network (SuperDARN) we investigate
the ionospheric convection response to magnetospheric substorms. Substorms
were identified using the Far Ultraviolet (FUV) instrument on board the
Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft, and
were then binned according to the magnetic latitude of their onset. A
superposed epoch analysis of the ionospheric convection patterns for each
onset-latitude bin was then performed using radar data for the interval 60 min
before onset to 90 min after. It is found that lower
onset-latitude substorms are associated with generally more enhanced
convection than the higher latitude substorms, although they suffer from a
significant localised reduction of the flow in the midnight sector during the
expansion phase. Higher-latitude substorms are associated with a significant
and rapid increase in the nightside convection following substorm onset, with
all onset-latitude bins showing an enhancement over onset values by ~60 min
into the expansion phase. A rudimentary inspection of the concurrent
auroral evolution suggests that the duration of the flow reduction following
substorm onset is dependent on the strength and duration of the expansion
phase aurora and its associated conductivity enhancement. |
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