Deeper and earlier penetrations of oxygen ions than protons into the inner magnetosphere Observed by Van Allen probes.

Kenji Mitani1, Kanako Seki2, Kunihiro Keika2, Louis J Lanzerotti3, Matina Gkioulidou4, Donald G Mitchell5 and Craig Kletzing6, (1)Nagoya-university, Institute for Space-Earth Environmental Research, Nagoya city, Japan, (2)The University of Tokyo, Tokyo, Japan, (3)New Jersey Institute of Technology, Center for Solar-Terrestrial Research, Newark, NJ, United States, (4)Applied Physics Laboratory Johns Hopkins, Laurel, MD, United States, (5)JHU/APL, Laurel, MD, United States, (6)University of Iowa, Iowa City, IA, United States