Abstract
The stationary statistics and persistence characteristics of both
hourly and daily total global solar radiation on tilted surfaces,
as well as of hourly normal beam radiation, on a discrete monthly
basis, are analyzed in a formalism akin to previous studies for global
horizontal solar radiation. Our database includes three Australian
locations of varying latitude and clearness index. We find that with
a proper geometric/statistical transformation, the Probability Density
Function (PDF) of global radiation on tilted surfaces can be accurately
predicted from the corresponding statistics for global horizontal
radiation, the latter typically being far more readily available.
The PDF of hourly normal beam radiation seems to be well predicted
via modification of a simple analytic functional form previously
proposed for modeling global horizontal radiation. Finally, the persistence
times and persistence strengths of global radiation on tilted surfaces
and of normal beam radiation are found, not surprisingly, to be very
similar to the corresponding values for global horizontal radiation.
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