Abstract
Transmissions from GPS and NNSS satellites have been used to determine the vertical total electron content (TEC) for observations made in the UK during June, November and December 1996. Differences between the TEC values obtained using GPS and NNSS arise from the influence of protonospheric electrons on the GPS signals. The GPS vertical TEC values were found to be greater than those calculated from NNSS, the difference representing the contribution from electrons in the high plasmasphere. The differences between the vertical electron content measurements vary on a diurnal basis, though no clear pattern has emerged from the limited sample of observations. The differences are larger for ray paths to the south than those to the north of the station with the magnitudes in the winter months being greater than those for summer.
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