Poster (Scientific congresses and symposiums)
Testing Predictions of the Ionospheric Convection from the Expanding/Contracting Polar Cap Paradigm
Walach, M.-T.; Mlan, S. E.; Yeoman, T. K. et al.
2015AGU Fall Meeting
Editorial reviewed
 

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Abstract :
[en] The expanding/contracting polar cap (ECPC) paradigm, or the time-dependent Dungey cycle, provides a theoretical framework for understanding solar wind-magnetosphere-ionosphere coupling. The ECPC describes the relationship between magnetopause reconnection and substorm growth phase, magnetotail reconnection and substorm expansion phase, associated changes in auroral morphology, and ionospheric convective motions. Despite the many successes of the model, there has yet to be a rigorous test of the predictions made regarding ionospheric convection, which remains a final hurdle for the validation of the ECPC. In this study we undertake a comparison of ionospheric convection, as measured by ion driftmeters on board DMSP (Defense Meteorological Satellite Program) satellites, with motions predicted by a theoretical model (Milan, 2013). The model is coupled to measurements of changes in the size of the polar cap made using global auroral imagery from the IMAGE FUV (Imager for Magnetopause to Aurora Global Exploration Far Ultraviolet) instrument, as well as the dayside reconnection rate, calculated using the OMNI dataset. The results show that we can largely predict the magnitudes of ionospheric convection flows using the context of our understanding of magnetic reconnection at the magnetopause and in the magnetotail.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Walach, M.-T.
Mlan, S. E.
Yeoman, T. K.
Hairston, M. R.
Hubert, Benoît  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Language :
English
Title :
Testing Predictions of the Ionospheric Convection from the Expanding/Contracting Polar Cap Paradigm
Publication date :
2015
Event name :
AGU Fall Meeting
Event date :
14 December - 18 December 2015
Audience :
International
Peer reviewed :
Editorial reviewed
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since 01 February 2018

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