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| Titel |
Probing discrete auroral arcs by ionospheric tomography |
| VerfasserIn |
J. Moen, S. T. Berry, L. Kersley, B. Lybekk |
| 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 ; 16, no. 5 ; Nr. 16, no. 5, S.574-582 |
| Datensatznummer |
250013277
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| Publikation (Nr.) |
 copernicus.org/angeo-16-574-1998.pdf |
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| Zusammenfassung |
Optical observations of 557.7 nm and 630.0 nm
emissions from discrete auroral arcs in the post-noon sector have been related
to localised field-aligned enhancements in the spatial distribution of E- and
F-layer electron density respectively seen in images reconstructed by
ionospheric tomography. Results from two case studies are presented in which
meridian scanning photometer and all-sky camera observations on Svalbard have
been compared to electron-density structures found by tomographic inversion of
measurements made by reception of radio signals at a chain of four stations at
high latitude. The F-layer features are long-lived and show exact correspondence
to the red-line emissions. Transient arcs in green-line intensity result in
E-region structures that are resolved in one case, but not in another where the
dynamic auroral forms are separated by less than one degree of latitude. The
signature of an inverted-V precipitation event is clearly evident in one
example.
Key words. Ionosphere (Auroral ionosphere) ·
Magnetospheric physics (Auroral phenomena) · Radio science (Ionospheric
physics) |
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