This paper presents the daily solar ultraviolet-B (UVB) values measured in
Madrid, Spain, during the period 1994-97 with a Brewer MKIV spectrophotomet
er. The range of the measured Values was 0.042-6.41 kJ m(-2). A description
of the values is shown. Periodicities of 7 and 3 days, associated with syn
optic patterns, are significant. Ozone (with 5- and 3-day periodicities) an
d cloudiness also are studied for the same period; their association with U
VB is investigated. The radiative amplification factor Value between UVB an
d ozone is 0.62. The correlation coefficient between UVB and a cloudiness i
ndex [equal to one minus the (number of sun hours divided by the number of
theoretical sun hours)] is -0.57. A time series model describing the UVB se
ries is shown. It is useful in estimating the UVB values, even on days when
radiation values are not available. It provides accurate performance, can
be used any day of the year, and has no main restrictions for its applicati
on. Thus, this kind of model can be a useful tool when modeling UVB behavio
r, complementing the information provided by other models.