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| Titel |
Application of stochastic inversion in auroral tomography |
| VerfasserIn |
T. Nygrén, M. Markkanen, M. Lehtinen, K. Kaila |
| 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 ; 14, no. 11 ; Nr. 14, no. 11, S.1124-1133 |
| Datensatznummer |
250012464
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| Publikation (Nr.) |
 copernicus.org/angeo-14-1124-1996.pdf |
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| Zusammenfassung |
| A software package originally developed for
satellite radio tomography is briefly introduced and its use in two-dimensional
auroral tomography is described. The method is based on stochastic inversion,
i.e. finding the most probable values of the unknown volume emission rates once
the optical measurements are made using either a scanning photometer or an
auroral camera. A set of simulation results is shown for a different number and
separations of optical instruments at ground level. It is observed that arcs
with a thickness of a few kilometers and separated by a few tens of kilometers
are easily reconstructed. The maximum values of the inversion results, however,
are often weaker than in the model. The most obvious reason for this is the grid
size, which cannot be much smaller than the arc thickness. The grid necessarily
generates a spatial averaging effect broadening the arc cross-sections and
reducing the peak values. Finally, results from TV-camera observations at
Tromsø and Esrange are shown. Although these sites are separated by more than
200 km, arcs close to Tromsø have been successfully reconstructed. |
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