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By reevaluating a 13-month stretch of Ulysses SWICS H pickup ion measurementsnear 5 AU close to the ecliptic right after the previous solar minimum, thispaper presents a determination of the neutral interstellar H density at thesolar wind termination shock and implications for the density and ionizationdegree of hydrogen in the LIC. The density of neutral interstellar hydrogen atthe termination shock was determined from the local pickup ion production rateas obtained close to the cut-off in the distribution function at aphelion ofUlysses. As shown in an analytical treatment for the upwind axis and throughkinetic modeling of the pickup ion production rate at the observer location,with variations in the ionization rate, radiation pressure, and the modeling ofthe particle behavior, this analysis turns out to be very robust againstuncertainties in these parameters and the modeling. Analysis using currentheliospheric parameters yields the H density at the termination shock equal to$0.087\pm0.022$ cm$^{-3}$, including observational and modeling uncertainties.

Density of neutral interstellar hydrogen at the termination shock from Ulysses pickup ion observations