Ion cyclotron waves in the high altitude cusp:: CLUSTER observations at varying spacecraft separations -: art. no. 2263 - Nykyri, K; Cargill, PJ; Lucek, EA; Horbury, TS; Balogh, A; Lavraud, B; Dandouras, I; Rème, H (GEOPHYSICAL RESEARCH LETTERS, 2003)