Geoscience Reference
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Fig. 3.4a,b.
The example of the spectrum correction of the results of upward flux measure-
ments 14th October 1983, time (Moscow) 7:12, altitude 4200 m:
a
the initial spectrum;
b
the
corrected spectrum
tometer information is rather effective. Figure 3.4 illustrates an example of the
error removal. The above-considered stages of the observational data process-
ing deal with the analysis of the spectra shape.
Regretfully the errors were also revealed when the spectrum had a correct
shape but differed from the “right” spectrum with the signal magnitude. To
elucidate such situations, the dependence of the irradiance upon the atmo-
spheric pressure and solar zenith angle was studied. The approximation of the
dependence using the quadratic formgave an approximating curve rather close
to single spectrums. If there had been some deviations, it would have been the
reason to test the spectra for errors. For every wavelength the approximation
of the dependence of the irradiance upon pressure
P
and the cosine of the solar
zenith angle
µ
0
was calculated (separately of the upwelling and downwelling
irradiances).
Here is the example of the approximation of the downwelling irradiance:
f
↓
(
P
,
µ
0
)
=
µ
0
+
a
4
P
2
+
a
5
µ
0
+
a
6
P
µ
0
.
a
1
+
a
2
P
+
a
3
(3.5)
Desired coefficients of the approximation
a
1
,...,
a
6
are obtained from the
totality of registered irradiances
f
↓
(
P
i
,
µ
0
i
) over every ascent and descent of
thesounding.Equationsystem(3.5)issolvedwiththeLST,wheretheinverse
squares of the random standard deviation of the irradiances (Table 3.1) are
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