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Massachusetts Institute of Technology Haystack Observatory, Westford, MA, United States The geospace plume couples the ionosphere, plasmasphere, and magnetosphere from sub-auroral regions to the magnetopause, on polar field lines, and into the magnetotail. We describe Van Allen Probes observations of ionospheric O+ ions at altitudes of 3–6 R E in the near vicinity of the geospace plume in the noon and post-noon sector. The temporal variation of warm ion fluxes observed as a function of time on a moving spacecraft is complicated by changing spacecraft position and complex ion drift paths and velocities that are highly sensitive to ion energy, pitch angle and L value. In the “notch” region of lower density plasma outside the morning-side plasmapause, bi-directionally field aligned fluxes of lower energy (

New yorkUnited statesEl lemdani mazouzRadiation belt storm probes missionEnergy densitiesUniversity of minnesotaEnergy densityUniversity of new hampshireAllen probes observationsVan allen probesMagnetic field instrumentIntegrated scienceAllen probesPitch angle distributions acrossGeospace plumeIon acceleration