FIRST RESULTS OF AURORAL TOMOGRAPHY FROM ALIS-JAPAN MULTI-STATION OBSERVATIONS IN MARCH 1995

Auroral tomography observations have been carried out in March, 1995, as a joint international campaign between Sweden and Japan. Three unma nned Swedish ALIS stations (Kiruna, Merasjarvi, Tjautjas) and two Japa nese JICCD sites (Abisko, Nikkaluokta), geographically separated by ab out 50 km at higher latitudes, were operated to capture multi-station monochromatic tomography images at 557.7 nm wavelength using CCD camer as. All cameras were pointing to one of the predetermined directions t o secure a common field of view. Several images of auroral arcs, mostl y for the core region right above Kiruna, have synchronously been take n by the multi-station imaging system. Tomographic inversion analysis for four-point images was carried out using the algebraic reconstructi on technique. Reconstructions of a curved are and of a double are syst em suggest promising application of this technique to the retrieval of three-dimensional auroral luminosity.