Kistler, L. M., Frey, H. U., Möbius, E., Mouikis, C., Quinn, J. M., Klecker, B., et al. (2002). Motion of auroral ion outflow structures observed with Cluster and Image FUV. Journal Geophysical Research, 107(A8): 1186. doi:10.1029/2001JA005075.