Cluster at the magnetospheric cusps - Cargill, PJ; Lavraud, B; Owen, CJ; Grison, B; Dunlop, MW; Cornilleau-Wehrlin, N; Escoubet, CP; Paschmann, G; Phan, TD; Rezeau, L; Bogdanova, Y; Nykyri, K (SPACE SCIENCE REVIEWS, 2005)