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Daily tabulation of hourly values
Monthly tables of data medians and quartiles
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absorption accuracy rules black-out blanketing characteristics component consulted conventions corresponding critical frequency cusp deduced descriptive letter determined E layer electron density Es trace extrapolation F layer F region F trace fmin fo F2 fo/Es foes fºnin fºr foſ fplot frequency scale frnin geophysical give h’Es height of maximum identified indicated interpolated ionization density ionogram ionosonde ionospheric sounding lower magnetic field Measurement influenced median count method MHz Mc/s minimum virtual height missing values MUF factor normal numerical value oblique observed obtained offmin Ordinary ray ordinary wave overlay parameters phenomena plasma frequency plot present qualifying and descriptive qualifying letter quartile quency R. W. Wright Rawer real height records reflection replaced sampling frequencies Section ſº solar spread echoes spread F standard studies tabulation sheet techniques tion top frequency trial median types URSI usually variations W. R. Piggott WWSC x-trace