Abstract
Observations of pulsating auroras with an all-sky Isocon TV system made from Poker Flat Research Range, Alaska, and Andøya rocket range, Norway, have revealed that auroral forms propagating like waves, (here termed recurrent propagating auroral forms) predominantly in the meridional direction, are a significant proportion of the group of auroras commonly labelled pulsating auroras. The wavelike forms are described and compared with pulsating patches. Characteristics of the two types differ sufficiently, that the possibility of different mechanisms should be considered. Propagation of the wave forms continues up to discrete arcs on the poleward edge of the diffuse aurora. One example is presented where no enhancement was observed within black aurora when the wave forms encountered this on their propagation path.
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