Statistical methods for research on diurnal variations

摘要: It is explained that research on the variability of diurnal variations necessary, because usual method discussing average alone leads one to overlook characteristic features phenomenon. The use harmonic dials for this purpose described, and formulae numerical graphical work are given. two-dimensional standard deviation probable ellipse estimating accuracy explained. procedure applied variation declination quiet days at Huancayo observatory in southern summer, results discussed. surprisingly large affects both amplitudes phases sine-waves. Some with particularly small picked out. Preliminary similar calculations Watheroo Observatory summarized, among others remarkable dial 24-hourly wave horizontal intensity, which indicates focus atmospheric current-system passes some north, other south Watheroo. remarks future added.