Lukas Saul, Peter Wurz, Diego Rodriguez, Jürgen Scheer, Eberhard Möbius, Nathan Schwadron, Harald Kucharek, Trevor Leonard, Maciej Bzowski, Stephen Fuselier, Geoff Crew, Dave McComas
Hydrogen gas is the dominant component of the local interstellar medium.
However, due to ionization and interaction with the heliosphere, direct
sampling of neutral hydrogen in the inner heliosphere is more difficult than
sampling the local interstellar neutral helium, which penetrates deep into the
heliosphere. In this paper we report on the first detailed analysis of the
direct sampling of neutral hydrogen from the local interstellar medium. We
confirm that the arrival direction of hydrogen is offset from that of the local
Helium component. We further report the discovery of a variation of the
penetrating Hydrogen over the first two years of IBEX observations.
Observations are consistent with hydrogen experiencing an effective ratio of
outward solar radiation pressure to inward gravitational force greater than
unity ({\mu}>1); the temporal change observed in the local interstellar
hydrogen flux can be explained with solar variability.
View original:
http://arxiv.org/abs/1202.0485
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