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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 11
Ann. Geophys., 14, 1124–1133, 1996
https://doi.org/10.1007/s00585-996-1124-1
© European Geosciences Union 1996
Ann. Geophys., 14, 1124–1133, 1996
https://doi.org/10.1007/s00585-996-1124-1
© European Geosciences Union 1996

  30 Nov 1996

30 Nov 1996

Application of stochastic inversion in auroral tomography

T. Nygrén1, M. Markkanen2, M. Lehtinen2, and K. Kaila1 T. Nygrén et al.
  • 1Department of Physical Sciences, University of Oulu, FIN-90570 Oulu, Finland
  • 2Geophysical Observatory, FIN-99600 Sodankylä , Finland

Abstract. 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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