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Ann. Geophys., 20, 301-309, 2002
www.ann-geophys.net/20/301/2002/
© European Geosciences Union 2002
The magnetopause shape and location: a comparison of the Interball and Geotail observations with models
J. Šafránková1, Z. Nĕmeček1, Š. Dušík1, L. Přech1, D. G. Sibeck2, and N. N. Borodkova3
1Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, 180 00 Praha 8, Czech Republic
2Applied Physics Laboratory, JHU, Laurel, Maryland, USA
3Space Research Institute, Moscow, Russia
Abstract. A number of magnetopause
models have been developed in the course of last three decades. We have chosen
seven of them and tested them using a fresh set of magnetopause crossings
observed by Interball-1, Magion-4, and Geotail satellites. The crossings cover
the magnetopause from the subsolar region up to near-Earth tail (XGSE ~ - 20 RE
) and all geomagnetic latitudes. Our study reveals that (1) the difference
between investigated models is smaller than the error of prediction caused by
the factors not included in models, (2) the dayside magnetopause is indented in
the cusp region, (3) the deepness of the indentation can reach ~ 4 RE , and (4)
the dimensions of the indentation do not depend on the dipole tilt, whereas its
location does.
Key words. Magnetopause,
magnetospheric physics, solar wind
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