Determination of ionospheric electron content from the Faraday rotation of geostationary satellite signals |
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| Authors: | JE Titheridge |
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| Institution: | Radio Research Centre, University of Auckland, New Zealand |
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| Abstract: | Calculations using a wide range of model ionospheres (with a peak at 300 km) show that the integrated electron content up to the height of the satellite could be up to four times the value deduced from Faraday rotation measurements. However, using a fixed mean field height of 400 km, the observed Faraday rotation gives the electron content up to a height hF of 2000 km with an accuracy of ±3 per cent. For observations at different magnetic and geographic latitudes, and geostationary satellites at different longitudes, the optimum value of hF varies by only ±200 km. Night-time increases in the height of the ionosphere have little effect on hF, but increase the mean field height to about 470 km. Using a fixed value of 420 km, with hF = 2000 km, gives an accuracy of ±5 per cent under most conditions. |
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