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| Titel |
Transpolar aurora: time evolution, associated convection patterns, and a possible cause |
| VerfasserIn |
L. G. Blomberg, J. A. Cumnock, I. I. Alexeev, E. S. Belenkaya, S. Yu. Bobrovnikov, V. V. Kalegaev |
| 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 ; 23, no. 5 ; Nr. 23, no. 5 (2005-07-28), S.1917-1930 |
| Datensatznummer |
250015276
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1917-2005.pdf |
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| Zusammenfassung |
| We present two event studies illustrating the detailed relationships between
plasma convection, field-aligned currents, and polar auroral emissions, as
well as illustrating the influence of the Interplanetary Magnetic Field's
y-component on theta aurora development. The transpolar arc of the theta
aurorae moves across the entire polar region and becomes part of the
opposite side of the auroral oval. Electric and magnetic field and
precipitating particle data are provided by DMSP, while the POLAR UVI
instrument provides measurements of auroral emissions. Ionospheric
electrostatic potential patterns are calculated at different times during
the evolution of the theta aurora using the KTH model. These model patterns
are compared to the convection predicted by mapping the magnetopause
electric field to the ionosphere using the Paraboloid Model of the
magnetosphere. The model predicts that parallel electric fields are set up
along the magnetic field lines projecting to the transpolar aurora. Their
possible role in the acceleration of the auroral electrons is discussed.
Keywords. Ionosphere (Plasma convection; Polar ionosphere)
– Magnetospheric physics (Magnetosphereionosphere
interactions) |
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