TOTAL ELECTRON CONTENT MEASUREMENTS AT HIGH LATITUDES.
Final scientific rept., 1 Jan 65-31 Oct 66,
FORSVARETS FORSKNINGSINSTITUTT KJELLER (NORWAY)
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The differential frequency Faraday technique has been applied to recordings, from three high latitude stations, of the 40 and 41 MHz transmission from the polar ionospheric beacon satellite S66 BE-B to obtain total ionospheric electron content. Results of the measurements are presented for the latitude range from 50 degrees N to 80 degrees N. The data is not sufficient to distinguish properly between diurnal and seasonal variations in electron content. The mean latitudinal variation gives a steady decrease of electron content with increasing latitude from 50 degrees to 60 degrees, a minimum in winter night between 60 degrees and 70 degrees, and an increase towards North, in night and early morning in winter, above 70 degrees. It is suggested that this anomolous variation may be explained by a phase shift of the diurnal variation at high latitudes compared to low. The electron content does not show a systematic dependence on magnetic K index. The equivalent slab thickness at 60 degrees and 70 degrees shows a seasonal and diurnal variation with a maximum in summer and at midday. The diurnal variation is most pronounced in winter. The slab thickness shows a slight increase with increasing K index. Author
- Nuclear Physics and Elementary Particle Physics