Relationship between auroral electrojet and Pc5 ULF waves

Applying a new data visualization technique to magnetic field observations from the Greenland west coast array we observe that Pc5 wave power spatial/temporal variations in the morning/pre-noon sector are closely related to the location and intensity of the auroral electrojet. This effect is not taken into account by existing theories of ULF Pc5 waves, but it could be significant for the development of more adequate models. Consideration of the most evident interpretation schemes shows that there is no simple explanation of this effect. An adequate interpretation may require a substantial revision or augmentation of existing Pc5 models. (C) 2001 Published by Elsevier Science Ltd.