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| Titel |
Magnetic interconnection of Saturn's polar regions: comparison of modelling results with Hubble Space Telescope UV auroral images |
| VerfasserIn |
E. S. Belenkaya, S. W. H. Cowley, V. V. Kalegaev, O. G. Barinov, W. O. Barinova |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 8 ; Nr. 31, no. 8 (2013-08-28), S.1447-1458 |
| Datensatznummer |
250086097
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1447-2013.pdf |
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| Zusammenfassung |
| We consider the magnetic interconnection of Saturn's
northern and southern polar regions controlled by the interplanetary
magnetic field (IMF), studying in particular the more complex and
interesting case of southward IMF, when the Kronian magnetospheric magnetic
field structure is the most twisted. The simpler case of northward IMF is
also discussed. Knowledge of the magnetospheric magnetic field structure is
very significant, for example, for investigation of the electric fields and
field-aligned currents in Saturn's environment, particularly those which
cause the auroral emissions. Here we modify the paraboloid magnetospheric
magnetic field model employed in previous related studies by including
higher multipole terms in Saturn's internal magnetic field, required for
more detailed considerations of inter-hemispheric conjugacy, together with
inclusion of a spheroidal boundary at the ionospheric level. The model is
employed to map Southern Hemisphere auroral regions observed by the Hubble Space Telescope (HST) in 2008
under known IMF conditions to both the equatorial plane and the northern
ionosphere. It is shown that the brightest auroral features map typically to
the equatorial region between the central ring current and the outer
magnetosphere, and that auroral features should be largely symmetric between
the two hemispheres, except for a small poleward displacement and
latitudinal narrowing in the Northern Hemisphere compared with the Southern
Hemisphere due to the quadrupole field asymmetry. The latter features are in agreement
with the conjugate auroras observed under near-equinoctial conditions in
early 2009, when IMF data are not available. |
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