The Low-latitude Ionospheric Tomography Network (LITN) is used to investigate the seasonal behavior of the equatorial anomaly in the Asian Sector during a period of solar minimum. Seasonal variations of the location, the time of occurrence, and the height and the electron density of the maximum peak of the anomaly are studied. The starting time for the development of the anomaly and the lifetime of the whole phenomenon are also investigated. Extension of the work for possible 4D monitoring of the ionosphere using COSMIC data is discussed.

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A Tomographic Study of Seasonal Variations of the Equatorial Anomaly in the Asian Sector

: In this paper the background of computerized tomography (CT) and its application to the ionosphere is reviewed. CT techniques, using only total electron content (TEC) data, can be used to reconstruct a two-dimensional image of the electron density in the ionosphere. The limitations of this technique are discussed and examples showing the limitations and capabilities are presented. Simulation results for two applications are presented: imaging the high latitude trough, and the correction of tracking radar range rate errors. Some possible extensions of the technique are presented.

John A. Klobuchar

Papers

Computerized Ionospheric Tomography