We report the progress in developing a Low-latitude Ionospheric Tomography Network (LITN) along the 121 degrees E meridian(Figure 1). LITN consists of an array of NNSS receiving stations covering the latitude range from Manila to Shanghai, and is specifically designed to enable large scale tomographic imaging over the equatorial anomaly region. Recently, we successfully applied computerized tomographic technique to obtain two-dimensional(2D) images of ionospheric electron density using measured TEC data from the network. The reconstruction is based on multiplicative algebraic reconstruction technique using the IRT model as an initial guess. To verify the quality of the reconstruction image, electron density profiles are reproduced from the image and compared with the profiles measured by ionosonde. It will be shown that IRI models can be used to facilitate such reconstruction.
LOW AND EQUATORIAL LATITUDES IN THE INTERNATIONAL REFERENCE IONOSPHERE (IRI)