Traces of a Ring Beam as observational limits for pickup ion transport: Pitch angle distributions obtained from 3D STEREO/PLASTIC He+ observations

Duncan Keilbach1, Verena Heidrich-Meisner2, Lars Berger3 and Robert F Wimmer-Schweingruber2, (1)University of Kiel, Kiel, Germany, (2)University of Kiel, Institute for Experimental and Applied Physics, Kiel, Germany, (3)Institute for Experimental and Applied Physics, Kiel, Germany