Ionospheric tomography is a rapidly developing technique for imaging ionization distributions. Owing to the system configuration, the resolving capability of these systems is still limited. A number of reconstruction algorithms have been developed which strive to form high resolution images by enhancing the available data with information provided by model ionospheres. This paper presents a new Fourier domain algorithm for ionospheric tomography which uses unique characteristics of ionospheric spectra to enhance the reconstructions. Unlike most model based algorithms, this solution is not limited to a linear combination of model ionospheres and data. This algorithm also uses a localized approach which enables reconstructions of varying resolution in different regions of the ionosphere. ¿ American Geophysical Union 1996