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An initial investigation of the magnetosphere at a system level using auroral oval radius and ring current intensity as state variables
Milan, S. E.; Hutchinson, J.; Boakes, P. D. et al.
2009AGU Fall Meeting 2009
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Keywords :
[2740] MAGNETOSPHERIC PHYSICS / Magnetospheric configuration and dynamics
Abstract :
[en] One approach to understanding the magnetosphere at a system level is to select a number of magnetospheric state variables and to examine statistically their inter-relationships and the temporal evolution of the magnetosphere through state-space. This talk outlines a first attempt at such a study, using the radius of the auroral oval, a proxy for the open flux content of the magnetosphere, and the Sym-H index, a measure of the intensity of the ring current, as the primary state variables. Using observations from the two-year period June 2000 to May 2002, the response of the state of the magnetosphere to differing solar wind inputs, and the evolution of the system state during geomagnetic storms is investigated. Our main finding is a characteristic evolution of magnetospheric state through the initial, main, and recovery phases of 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Milan, S. E.;  University of Leicester, Leicester, United Kingdom
Hutchinson, J.;  University of Leicester, Leicester, United Kingdom
Boakes, P. D.;  University of Leicester, Leicester, United Kingdom
Hubert, Benoît  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Language :
English
Title :
An initial investigation of the magnetosphere at a system level using auroral oval radius and ring current intensity as state variables
Publication date :
01 December 2009
Event name :
AGU Fall Meeting 2009
Event date :
2009
Audience :
International
Peer reviewed :
Editorial reviewed
Available on ORBi :
since 09 June 2010

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