Electron content obtained from Faraday rotation and phase path length variations

Abstract A critical study is made of electron content calculations made by measurements of polarization rotation and phase path length changes. The accuracies of the principal methods are examined for satellites in ‘low’, eccentric and geostationary orbits. Observed variation with local time, latitude, season, solar cycle and in ionospheric storms are summarized. Finally the relevance of these measurements to existing ionospheric problems is discussed.

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