VARIABILITY IN SPACE OF SOLAR RADIATION
An outline of the history of the Danish radiation measurements is given with particular emphasis on the difficulties concerning the stations and the debugging computer programmes. Data from six stations in Zealand, Denmark measuring global radiation are subject to a statistical analysis. Series of simultaneous observations from the period January 1980 to August 1981 were adapted by means of an automatic error finding procedure and systematic errors were corrected. The structures in data are investigated, in particular aiming at revealing properties which may be exploited for the study of spatial correlations. It is found that traditional calculations of correlation coefficients do not satisfactorily compensate for certain known variance structures in the data. A logarithmic transformation of the data is shown to be useful. The report provides a statistical model which is used for the analysis. An important characteristic of the model is that it specifies the (logarithmic) mean values as composed of a site specific parameter and a time specific parameter, describing the variation of the global variation in time to be primarily systematic, rather than stochastic. All correlations are defined in light of this model. The spatial correlation function is estimated and confidence limits for interpolation of global radiation influx to sites between measuring stations are given.
Bibliographic Reference: EUR 10204 EN (1985) MF, 116 P., BFR 300, BLOW-UP COPY BFR 580, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124031300 / Last updated on: 1987-01-01
Available languages: en