The root mean square deviation (rms) between TOF monthly median measurements and TOF monthly median predictions and the differences (DP) between the length of the median and predicted ray path have been calculated.
The differences between the retrieved values and the monthly median values computed from IRI are interpreted as the superposition of a systematic bias (attributed to both, IRI and ROP), random errors in ROP, and the day-to-day variability, which is unaccounted for by IRI.
Instantaneous results (i) and monthly median results (m) are shown.
Each season is represented by a monthly median value.
Figure 2 Monthly median near-noon foF2 values versus monthly mean F10.7 (a); monthly absolute deviations ΔfoF2 (b).
Such expressions relate to the monthly median or to specific daily percentile values of these quantities.
Preliminary validation tests give evidence for significant improvement over monthly median values.
Basic data are monthly median foF2 values obtained in the global network of ionospheric stations.
Figure 10 shows the h′F monthly median data at all four sites, thus demonstrating that monthly medians were higher at HK and GZ than at BJ and CC.
The scatter plots of the monthly median Hm values against the monthly median values of (a) NmF2, (b) hmF2, (c) Bo and (d) EST, for Ebro.
