Television (TV) data obtained during the development of an auroral form contain information about the spatial and temporal dynamics of the form generation. It is possible to investigate the spatial distribution of auroral luminosity in each image. Also, one can study the temporal dynamics of aurora using keograms or virtual photometers. In this report we investigate the temporal dynamics using information about the spatial distribution of auroral luminosity to define the metric in space of images. The algorithm of Grassberger--Procaccia has been applied to obtain the correlation dimension as a characteristic of the temporal chaos in sets of TV images of aurora. The approach has been applied to TV observations of pulsation aurora at Lovozero station.