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Interstellar Pickup Ion Observations to 38 au

McComas, D. J.; Schwadron, N. A.; Szalay, J. R. +9 more

We provide the first direct observations of interstellar H⁺ and He⁺ pickup ions in the solar wind from 22 to 38 au. We use the Vasyliunas and Siscoe model functional form to quantify the pickup ion distributions, and while the fit parameters generally lie outside their physically expected ranges, this form allows fits that qu…