Observed fluctuations in auroral brightness are reported for the frequency band 0.05 < ƒ < 15 Hz from a site at 60.7° invariant latitude. Four clearly distinct frequency bands were found to exist: at 7 and 2.4 s period, and at 3 and 10 Hz. The spatial distribution of the fluctuations was studied; it is several hundred km in longitudinal extent, narrow in the evening in latitudinal extent but broadening to perhaps 200 km in the early morning, homogeneous and stationary in the sky, equatorward of discrete quiet auroral forms, and strongly responsive to the level of geomagnetic disturbance. The relationship of this fluctuating region to the recently discovered diffuse auroral belt, and the region of hard drizzle precipitation observed by a number of workers is described and discussed. The pulsation mechanism described by Coroniti and Kennel seems very plausible for the 7 and 2.4 s period pulsations.