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Ann. Geophys., 23, 2635-2646, 2005
www.ann-geophys.net/23/2635/2005/
© European Geosciences Union 2005
Comparisons between EUV/IMAGE observations and numerical simulations of the plasmapause formation
V. Pierrard1 and J. Cabrera2
1Belgian Institute for Space Aeronomy, Brussels, Belgium
2Center for Space Radiations, UCL, 1348 Louvain-La-Neuve, Belgium
Abstract. Simulations of plasmapause formation described in Pierrard and Lemaire (2004)
predict the shape and equatorial distance of the plasmapause as a
function of the geomagnetic activity index Kp. The equatorial positions
predicted by this model are compared with the observations of EUV/IMAGE
during the geomagnetic storm of 24 May 2000, substorm events of 10 June
2001 and 25 June 2000, and also during a prolonged quiet period (2 May
2001) when the plasmasphere was very extended. The formation of structures,
like plumes and shoulders observed during periods of high geomagnetic
activity, is quite well reproduced by the simulations. These structures are
directly related to specific time sequences of Kp variations. The radial
distances of the plasmapause are also reproduced, on average, by the model.
Keywords. Magnetospheric physics (Plasmasphere; Storms
and substorms; Solar wind magnetosphere interactions)
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