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Interstellar He⁺ ring-beam distributions: Observations and implications

Galvin, Antoinette B.; Wimmer-Schweingruber, Robert F.; Berger, Lars +1 more

We report systematic measurements of the distribution of the incident angle of interstellar pickup He⁺ ions as observed by STEREO/Plasma and Supra-Thermal Ion Composition (PLASTIC). We have organized these observations according to the angle spanned by the Interplanetary Magnetic Field (IMF), B→, and the bulk solar wind velocity, vsw