Pitch Angle Dependence of Drift Resonant Ions Observed by the Van Allen Probes

Robert Rankin1, Chengrui Wang2, Yongfu Wang3, Q. -G. Zong4 and Xuzhi Zhou3, (1)University of Alberta, Department of Physics, Edmonton, AB, Canada, (2)University of Alberta, Edmonton, AB, Canada, (3)Peking University, School of Earth and Space Sciences, Beijing, China, (4)Peking University, Institute of space physics and applied technology, Beijing, China