Characterizing interstellar and secondary helium in the heliosphere

Physics – Plasma Physics

Scientific paper

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[2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [2144] Interplanetary Physics / Interstellar Gas, [2151] Interplanetary Physics / Neutral Particles, [7837] Space Plasma Physics / Neutral Particles

Scientific paper

Two years of neutral measurements by IBEX-Lo have refined the observational knowledge of interstellar neutral helium and oxygen, and of secondary neutral helium and oxygen created in the heliosphere. Detailed modeling is needed to connect the measured fluxes to the pristine local interstellar medium while accounting for loss and production of neutral particles during their path through the heliosphere. In this contribution, global heliosphere models are connected to analytic calculations of neutral trajectories to obtain detailed estimates of the neutral distribution function of helium, with emphasis on the innermost heliosphere where IBEX is measuring.

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