Comparing the reanalysed Chilton data with original Slough data
The reanalysed December data was then compared with the Slough data to see if
the reanalysis of the Chilton data had any significant effect on the comparison
between the two sites. The following points emerged from this comparison.
- M3000(F2). The scatter of points is not significantly reduced, but
the lower values from Chilton are increased slightly.
- fmin. The reanalysis of fmin values has resulted in a much better
correlation and the resulting best fit line through the data. The scatter of
points has not been significantly reduced however, and this remaining
difference is probably an instrument effect.
- foE. The reanalysis of foE values has slightly improved the
gradient. The correlation coefficient has not changed.
- foEs has an almost identical distribution of points than
before. The Chilton sounder seeing denser layers than Slough on a large number of
occasions. This is most likely an instrument effect.
- foF1. A few of the Chilton data points have been discarded after
reanalysis, leaving only two points. Although no significant line
can be fitted through these points, one of the remaining points is in good
- foF2 The foF2 statistics are largely unchanged. The correlation,
and offset values are slightly improved.
- FxI. The rescaled values are almost unchanged.
- h'E. The scatter of points is increased for the reanalysed
data. This is in part due to the increased number of Chilton points that have
been set to 90 km.
- h'Es. After reanalysis, this parameter is more clearly divided into
two groups of points. Those whose h'Es values agree, and those whose Chilton
values are anomalously low. This has resulted in the correlation between the
two data sets increasing.
- h'F. The distribution of points has remained largely unchanged,
although the correlation has dropped by two percent.
- h'F2. The addition of several higher common h'F2 points has
resulted in a more well defined distribution of values. All the points lie
below the expected line however.
19/02/97 Chris Davis