Sumy dzienne promieniowania słonecznego w okresie letnim w Felinie koło Lublina i ich związek z usłonecznieniem i zachmurzeniem Daily sums of solar radiation during summer period in Felin near Lublin and their relationship with sunshine duration and cloudiness
The paper presents the relationships
between daily sums of global solar
radiation and real sunshine duration and
separately, mean for a day amount of total
cloudiness (computed from three standard
observation terms) within 11 May – 31 July
period in Felin. This period is approximated
to the insolation summer one and is characterised by a long day (at least 15.5) and slight
differentiation in time. The relationships
were obtained on the basis of mean decade
data and a stretch of single days during fi ve
seasons (but not successive). They were described
with two types of equation regressions:
linear and curvilinear (a 2-degree polynomial).
Additionally, the same relationships
were determined regarding the days without
and with precipitation during the examind
summer periods. The analysis performed
in relation to effectiveness of each of these
equations application to estimate daily sums
of global solar radiation (the relative and
standard errors) showed that better results
are obtained from the equations concerning
relations of the solar radiation with sunshine
duration than cloudiness. It also reveated that
to describe both types of the relationships, a polynomial is more effi cient than linear
regression (particularly in the case of daily
data examination). Moreover, it was stated
that determination of these relationships for
some specifi c days (eg. days without precipitation)
is appropriate as it allws to estimate
the daily sum of solar radiation with smaller
errors.
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