Cluster observes the high-altitude cusp region - Lavraud,B; Rème,H; Dunlop,MW; Bosqued,JM; Dandouras,I; Sauvaud,JA; Keiling,A; Phan,TD; Lundin,R; Cargill,PJ; Escoubet,CP; Carlson,CW; et al. (SPRINGER, 2005)