We discuss a consolidation of determinations of the density of neutral interstellar H at the nose of the termination shock carried out with the use of various data sets , techniques , and modeling approaches .
In particular , we focus on the determination of this density based on observations of H pickup ions on Ulysses during its aphelion passage through the ecliptic plane .
We discuss in greater detail a novel method of determination of the density from these measurements and review the results from its application to actual data .
The H density at TS derived from this analysis is equal to 0.087 \pm 0.022 cm ^ { -3 } , and when all relevant determinations are taken into account , the consolidated density is obtained at 0.09 \pm 0.022 cm ^ { -3 } .
The density of H in CHISM based on literature values of filtration factor is then calculated at 0.16 \pm 0.04 cm ^ { -3 } .