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Neutral interstellar helium parameters based on IBEX-Lo observations and test particle calculations by Bzowski, M.; Kubiak, M. A.; Moebius, E.; Bochsler, P.; Leonard, T.; Heirtzler, D.; Kucharek, H.; Sokol, J. M.; Hlond, M.; Crew, G. B.; Schwadron, N. A.; Fuselier, S. A.; McComas, D. J. is a scholarly article available to read on EtoBox.

What is Neutral interstellar helium parameters based on IBEX-Lo observations and test particle calculations about?

Neutral Interstellar Helium (NISHe) is almost unaffected at the heliospheric interface with the interstellar medium and freely enters the solar system. It provides some of the best information on the characteristics of the interstellar gas in the Local Interstellar Cloud. The Interstellar Boundary Explorer (IBEX) is the second mission to directly detect NISHe. We present a comparison between recent IBEX NISHe observations and simulations carried out using a well-tested quantitative simulation code. Simulation and observation results compare well for times when measured fluxes are dominated by NISHe (and contributions from other species are small). Differences between simulations and observations indicate a previously undetected secondary population of neutral helium, likely produced by interaction of interstellar helium with plasma in the outer heliosheath. Interstellar neutral parameters are statistically different from previous in situ results obtained mostly from the GAS/Ulysses experiment, but they do agree with the local interstellar flow vector obtained from studies of interstellar absorption: the newly-established flow direction is ecliptic longitude 79.2 deg, latitude -5.1

Author

Bzowski, M.; Kubiak, M. A.; Moebius, E.; Bochsler, P.; Leonard, T.; Heirtzler, D.; Kucharek, H.; Sokol, J. M.; Hlond, M.; Crew, G. B.; Schwadron, N. A.; Fuselier, S. A.; McComas, D. J.

Published

2012

Language

EN