Tomographic Imaging Of Ionospheric Electron Density Over Eastern Africa Using Multi-platform Instrumentations And Model Ionospheric Total Electron Content

A 3D - computerized tomography technique has been used to investigate the electron densityrnof the low - latitude ionosphere during the low solar minimum in 2008 over the East Africarnregion. The 3D - tomography uses Damped Least Square inversion with the second orderrnTikhonove Regularization (DLSTR) algorithm. The TEC used in the tomographic inversionrnis obtained from the observables measured by a chain of station reciving transit satelliterntransmission over the region. The algorithm employes electron density from NeQuick modelrnas apriori values. The electron density obtained from the inversion is a weighted combinationrnof the apriori electron density and that obtaind from GPS measurement. The results show thatrnthe reconstructed electron density exhibits the required diurnal, latitudinal and longitudinalrnvariations consistent with the physics of plasma formation and transport

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