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)