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Neutral Interstellar Helium Parameters Based on IBEX-Lo Observations and Test Particle Calculations

Bochsler, P.; McComas, D. J.; Fuselier, S. A. +10 more

Because of its high ionization potential and weak interaction with hydrogen, neutral interstellar helium (NISHe) is almost unaffected at the heliospheric interface with the interstellar medium and freely enters the solar system. This second most abundant species provides some of the best information on the characteristics of the interstellar gas i…

Editorial: Interstellar Boundary Explorer (IBEX): Direct Sampling of the Interstellar Medium

McComas, D. J.

This special supplement issue of the Astrophysical Journal comprises six coordinated papers that provide the first detailed analyses of the direct sampling of interstellar neutral atoms by the Interstellar Boundary Explorer (IBEX). Interstellar atoms are the detritus of older stars—their stellar winds, novae, and supernovae—spread across the galax…