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. 2022 May 9;218(4):28. doi: 10.1007/s11214-022-00895-2

Fig. 20.

Fig. 20

Interstellar H+ (black) and He+ (red) PUI observations made by STEREO PLASTIC at 1 au, Ulysses SWICS at 5 au, and New Horizons’ SWAP at 22–47 au. (a) Ratio of interstellar H+ PUI density to total proton density (SWI + PUI). (b) Ratio of interstellar PUI thermal energy to local injection energy. Models of the density and energy ratios are also shown. New Horizons and Ulysses observations are made at different ecliptic longitudes and reflect different ionization cavity sizes; therefore, we rotate SWICS H+ PUI densities towards the longitude of New Horizons’ trajectory