  The Interstellar Boundary EXplorer (IBEX) mission has recently studied the
flow of interstellar neutral He atoms through the solar system, and discovered
the existence of a secondary He flow likely originating in the outer
heliosheath. We find evidence for this secondary component in Ulysses data. By
coadding hundreds of Ulysses He beam maps together to maximize signal-to-noise,
we identify a weak signal that is credibly associated with the secondary
component. Assuming a laminar flow from infinity, we infer the following He
flow parameters: V=12.8+/-1.9 km/s, lambda=74.4+/-1.8 deg, beta=-10.5+/-4.1
deg, and T=3000+/-1100 K; where lambda and beta are the ecliptic longitude and
latitude direction in J2000 coordinates. The secondary component has a density
that is 4.9+/-0.9% that of the primary component. These measurements are
reasonably consistent with measurements from IBEX, with the exception of
temperature, where our temperature is much lower than IBEX's T=9500 K. Even the
higher IBEX temperature is suspiciously low compared to expectactions for the
outer heliosheath source region. The implausibly low temperatures are due to
the incorrect assumption of a laminar flow instead of a diverging one, given
that the flow in the outer heliosheath source region will be deflecting around
the heliopause. As for why the IBEX and Ulysses T values are different,
difficulties with background subtraction in the Ulysses data are a potential
source of concern, but the discrepancy may also be another effect of the
improper laminar flow assumption, which could affect the IBEX and Ulysses
analyses differently.
