On 30 November 1999, the Italian all-sky camera ITACA (Ny-¿lesund, Svalbard), observed one of the strongest dayside aurora events occurred during the 1999/2000 winter season. In the postnoon, the red auroral activity was characterized mainly by four quasiperiodic pulsed activations, with brightness, period and latitudinal extent increasing monotonically with time. During this period, the Wind satellite was well positioned upstream in the solar wind and measured a IMF Bz close to zero, together with a constantly negative IMF By ~ -10 nT. A detailed description of the phenomenon is presented, together with a preliminary analysis of the data. This work underlines that it is difficult to identify, among the parameters usually involved in the solar wind--magnetosphere coupling, the source of the modulation(s) observed in the aurora development.