Abstract
Positioning of auroras in all-sky images taken by instruments such as low-light level TV cameras has long been important in understanding how an ambiguity of luminous positions is removed with appropriate models which take into account specific altitude profiles of auroras in the ionosphere. We have developed a method to estimate locations of auroral columns along the earth's magnetic lines of force by an inversion procedure. Two-dimensional luminosity distribution in raw data is considerably large in the data size to be processed at a given time and we show that the problem can be reduced into a simple one-dimensional problem. Models of auroral arcs with simple altitude profile are used. Locations of reconstructed image profiles show decomposing arcs well concentrated only around the lower border of the arcs in the original image data. The method is shown to be effective when it is applied to observed data including a simple auroral arc.
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