Total electron content measurements in ionospheric physics |
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Authors: | TW Garner TL Gaussiran II BW Tolman RB Harris RS Calfas H Gallagher |
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Institution: | 1. Space and Geophysics Laboratory, Applied Research Laboratories, The University of Texas at Austin, 10000 Burnet Road, F0252, Austin, TX 78758-4423, USA;2. Department of Physics, State University of New York at Oneonta, Oneonta, NY 13820, USA |
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Abstract: | With the advent of modern global networks of dual-frequency Global Positioning System (GPS), total electron content (TEC) measurements along slant paths connecting GPS receivers and satellites at 22,000 km have become the largest data set available to ionospheric scientists. The TEC can be calculated from the time and phase delay in the GPS signal using the GPS Toolkit, but an unknown bias will remain. In addition, UHF/VHF radio beacons on board low-Earth-orbiting satellites can also be used to measure the electron content. However, the TEC measurements are obtained by integrating TEC differences between slant paths, but also contain biases. It is often necessary to use data assimilative algorithms like the Ionospheric Data Assimilation Three-Dimensional (IDA3D), and to treat both GPS- and LEO-beacon TEC measurements as relative data in order to conduct ionospheric studies. |
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Keywords: | Electron content Ionospheric data |
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