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| Titel |
Shape of the dayside equatorial magnetopause |
| VerfasserIn |
Jiri Simunek, Jana Safrankova, Zdenek Nemecek, Lubomir Prech |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148775
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| Publikation (Nr.) |
 EGU/EGU2017-13062.pdf |
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| Zusammenfassung |
| A magnetopause location is generally believed to be determined by the solar wind
dynamic pressure and by a sign and value of the interplanetary magnetic field (IMF)
vertical (Bz) component. The contribution of other parameters is usually considered
to be minor or negligible near the equatorial plane. A great majority of present
magnetopause models describes the magnetopause shape with an ellipsoid or paraboloid
of revolution. The axis of such surface usually reflects the Earth orbital motion
around the Sun. Ten years of magnetopause observations near the equatorial plane by
the THEMIS spacecraft allow to tests of this description and facilitates search for
a better approximation of the magnetopause shape. We present a statistical study
based on more than several thousand magnetopause crossings identified in the THEMIS
data. The study accounts for a dependence of the magnetopause location on the
upstream solar wind dynamic pressure and expects that all other effects can be
averaged. The study suggests a very simple expression for the shape of the dayside
magnetopause and examines the influence of IMF and solar wind parameters on this
shape. The effects of magnetospheric current systems are also discussed. |
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