The calculation of the heights of the peaks of the ionospheric layers

Physics

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Scientific paper

The five-point Kelso analysis, for calculating the real height of reflection at any frequency in terms of the virtual heights at five lower frequencies, is compared with a single-polynomial analysis using the same frequencies. The two methods are found to give the same result, to within one part in a thousand, for any virtual height curve. When used to calculate the real height (hm) at a critical frequency, both methods give a result which is 10-20 km too low. The polynomial method was therefore modified by including a parabolic peak in the assumed form of the real height curve. This reduces the systematic error inhm to less than 0.5 km. The same result can be obtained by adding a correction C(h5' - h4') to the Kelso analysis. Values of C are given for use with five and ten point Schmerling coefficients at dip angles up to 80 degrees.

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