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| Titel |
The response of the azimuthal component of the ionospheric electric field to auroral arc brightening |
| VerfasserIn |
V. Safargaleev, W. Lyatsky, N. G. Gazey, P. N. Smith, V. Kriviliov |
| 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.65-73 |
| Datensatznummer |
250013882
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| Publikation (Nr.) |
 copernicus.org/angeo-18-65-2000.pdf |
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| Zusammenfassung |
We have analyzed the response of azimuthal
component of the ionospheric electric field to auroral arc activity. We have
chosen for analysis three intervals of coordinated EISCAT and TV observations on
18 February, 1993. These intervals include three kinds of arc activity: the
appearance of a new auroral arc, the gradual brightening of the existing arc and
variations of the arc luminosity. The arcs were mostly east-west aligned. In all
cases, the enhancement of arc luminosity is accompanied by a decrease in the
westward component of the ionospheric electric field. In contrast, an increase
of that component seems to be connected with arc fading. The observed response
is assumed to have the same nature as the "short circuit" of an
external electric field by the conductor. The possible consequence of this
phenomenon is discussed..
Keywords. Ionosphere (electric fields and currents;
ionospheric irregularities) · Magnetospheric physics (auroral phenomena) |
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