Physics
Scientific paper
Dec 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29.1595b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 12, pp. 1595-1601
Physics
Scientific paper
Using expanded-scale ionograms obtained at Aberystwyth the integrated sub-peak electron content of both the E- and F1-regions has been calculated at quarter-hourly intervals over the day for the summer period 1962-1963. The absolute values obtained and the mean diurnal variation for each layer are compared with those expected for a Chapman profile. It is found that the diurnal curves are asymmetrical about noon, in opposite senses for the two layers, such that over the middle-day period the E-region content is elevated and the F1-region content depressed. Comparison with magnetic field data, and with the previously established changes in peak height and peak density arising from geomagnetic distortion of these layers, leads to the conclusion that the changes in sub-peak content result directly from the perturbing influence of the S[alpha] current system. It is shown that in the distortion of the electron density profile it is the change in hm, rather than that in Nm, which determines the change in [is proportional to] Ndh below the peak.
Brown Michael G.
Wynne R.
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