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| Titel |
Multi-instrument observations of the electric and magnetic field structure of omega bands |
| VerfasserIn |
J. A. Wild, T. K. Yeoman, P. Eglitis, H. J. Opgenoorth |
| 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 ; 18, no. 1 ; Nr. 18, no. 1, S.99-110 |
| Datensatznummer |
250013886
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| Publikation (Nr.) |
 copernicus.org/angeo-18-99-2000.pdf |
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| Zusammenfassung |
High time resolution data from the CUTLASS
Finland radar during the interval 01:30-03:30 UT on 11 May, 1998, are employed
to characterise the ionospheric electric field due to a series of omega bands
extending ~5° in latitude at a resolution of 45 km in the meridional direction
and 50 km in the azimuthal direction. E-region observations from the STARE
Norway VHF radar operating at a resolution of 15 km over a comparable region are
also incorporated. These data are combined with ground magnetometer observations
from several stations. This allows the study of the ionospheric equivalent
current signatures and height integrated ionospheric conductances associated
with omega bands as they propagate through the field-of-view of the CUTLASS and
STARE radars. The high-time resolution and multi-point nature of the
observations leads to a refinement of the previous models of omega band
structure. The omega bands observed during this interval have scale sizes ~500
km and an eastward propagation velocity ~0.75 km s-1. They occur in
the morning sector (~05 MLT), simultaneously with the onset/intensification of a
substorm to the west during the recovery phase of a previous substorm in the
Scandinavian sector. A possible mechanism for omega band formation and their
relationship to the substorm phase is discussed..
Key words. Ionosphere (auroral ionosphere; electric
fields and currents) · Magnetospheric physics (magnetosphere-ionosphere
interactions) |
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