Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10326621g&link_type=abstract
Journal of Geophysical Research, Volume 103, Issue A11, p. 26621-26632
Physics
11
Ionosphere: Auroral Ionosphere, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Instruments And Techniques
Scientific paper
In this report the problems of resolution and noise sensitivity of tomographic reconstructions from ground-based multistation imaging of aurora with the auroral large imaging system (ALIS) are considered. ALIS is a ground-based grid of high-performance CCD-imaging stations at high latitudes. For evaluation of the resolution and noise sensitivity of current tomographic reconstruction procedures a full model simulation of the ALIS system is presented. The results show that relative errors are typically in the range 0.05-0.1 for typical noise levels in measurements of aurora. A general method to estimate resolution in a tomographic imaging system is developed and used to give estimates of the horizontal and vertical resolution. Its current limitations and future perspective are briefly discussed. A method to retrieve feasible tomographic reconstructions from a few image projections with variable noise level are outlined.
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