Recent developments in tomographic imaging allow the use of GPS satellite data to image the Earth's ionosphere. Ground-based GPS receivers monitor the Earth's ionosphere continuously and a comprehensive database of ionospheric measurements suitable for tomographic processing now exists. The tomographic inversion of these GPS data in a three-dimensional time-dependent inversion algorithm can reveal the spatial and temporal distribution of ionospheric electron density. This new technique is unique for studying ionospheric ...
A new technique has been developed to reveal the temporal and spatial distribution of ionization in the ionosphere and plasmasphere. The technique uses freely-available GPS satellite data over the continents of the Northern Hemisphere to produce fully four-dimensional movies of the ionization distribution. In this report a quantitative, large-scale study has been undertaken to evaluate the technique over the USA. The research focuses on two periods. The first is a ...
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