TT Ari-94: A Study of 1.6...60 Minute Variability

We report photometric results from 44 runs at 11 observatories during the international campaign ‘TT Ari-94’. No coherent oscillations in the frequency range 10...900 cycle d-1 are found. The highest peaks in the power spectrum cover the wide range of 28...139 cycle d-1. Variations occur at a few preferred time-scales rather than at one cycle length, with a possible secular decrease. In the frequency range 90...900 cycle d-1 the power spectrum obeys a power law with slope γ ranging from 0.8 to 2.6 for different runs.