How representative are nighttime determinations of the upper edge of the EF-valley?
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Applying the author's extrapolation procedure to a summer and a winter set of midlatitude nightime digital ionograms the uncertainty of the upper edge of the EF-valley is found to be up to 10 km but has no noticeable effect on the peak altitude determination. The retardation near fmin is 12 to 30 km.
CitationBossy, L. (1995). How representative are nighttime determinations of the upper edge of the EF-valley?. , Advances in Space Research, Vol. 15, Issue 2, 157-160, DOI: 10.1016/S0273-1177(99)80040-4.