Abstract. Simultaneous TV data of pulsating auroras were ob-patches occurred in phase, but 'expansion type' patches octained at two nearly conjugate stations, Husafell in Iceland and curred out of phase or synchronously. The 'pure type' refers Syowa in Antarctica on September 9-10, 1994. An investiga-to patches which pulsate without appreciable change in size or tion of the spatial and temporal coherence of pulsating patches shape, whereas 'expansion type' refers to patches where the revealed the following characteristics: (1) The overall dynamic pulsations begin with an initial brightening of a core and the variations and activities of the pulsating features were very pulsating area then expands in one or more directions similar at both stations. because of the possibility that the lack of conjugacy in the