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Diurnal variation of the mean Faraday factor at Arecibo

1970; American Geophysical Union; Volume: 75; Issue: 4 Linguagem: Inglês

10.1029/ja075i004p00823

2156-2202

D. Smith,

Geomagnetism and Paleomagnetism Studies

Estimates of the total electron content of the ionosphere can be obtained from measurements of the Faraday rotation of VHF signals from a geostationary satellite. The accuracy of the estimates depends in part on the accuracy with which the mean value of the ‘Faraday factor’ , is known. A description is given of a method of calculating this factor by making use of the electron number density profiles obtained from a backscatter radar installation. For a 30-hour period of observation at Arecibo in January 1969, it is shown that had a predawn minimum nearly 30% lower than its daytime maximum. The diurnal variation of did not show an inverse dependence on the hmax.