Main Article Content
measurements. The combination of two-frequency measurements can be used to derive the integral of the electron
concentration along each satellite-to-receiver path, a parameter known as the Total Electron Content (TEC). At this
stage these slant TEC data are diffi cult to interpret as they originate from a combination of a temporally changing
ionosphere and spatially changing observation geometry. In this paper TEC data are inverted to evaluate the underlying
distribution and time evolution of electron concentration. Accordingly, a new three-dimensional, time-dependent
algorithm is presented here for imaging ionospheric electron concentration using GPS signals. The inversion results
in a three-dimensional movie rather than a static image of the electron-concentration distribution. The technique is
demonstrated using simulated ground-based GPS data from actual measurement geometry over Europe.
No Permission Required
Istituto Nazionale di Geofisica e Vulcanologia applies the Creative Commons Attribution License (CCAL) to all works we publish.
Under the CCAL, authors retain ownership of the copyright for their article, but authors allow anyone to download, reuse, reprint, modify, distribute, so long as the original authors and source are cited. No permission is required from the authors or the publishers.