Local Interstellar Medium: Six Years of Direct Sampling by IBEX

McComas, D. J.; Bzowski, M.; Fuselier, S. A.; Frisch, P. C.; Galli, André; Izmodenov, V. V.; Katushkina, O. A.; Kubiak, M. A.; Lee, M. A.; Leonard, T. W.; Moebius, E.; Park, J.; Schwadron, N. A.; Sokol, J. M.; Swaczyna, P.; Wood, B. E.; Wurz, Peter (2015). Local Interstellar Medium: Six Years of Direct Sampling by IBEX. Astrophysical journal - supplement series, 220(2), p. 22. Institute of Physics Publishing IOP 10.1088/0067-0049/220/2/22

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The Interstellar Boundary Explorer (IBEX) has been directly observing neutral atoms from the local interstellar medium for the last six years (2009–2014). This paper ties together the 14 studies in this Astrophysical Journal Supplement Series Special Issue, which collectively describe the IBEX interstellar neutral results from this epoch and provide a number of other relevant theoretical and observational results. Interstellar neutrals interact with each other and with the ionized portion of the interstellar population in the “pristine” interstellar medium ahead of the heliosphere. Then, in the heliosphereʼs close vicinity, the interstellar medium begins to interact with escaping heliospheric neutrals. In this study, we compare the results from two major analysis approaches led by IBEX groups in New Hampshire and Warsaw. We also directly address the question of the distance upstream to the pristine interstellar medium and adjust both sets of results to a common distance of ~1000 AU. The two analysis approaches are quite different, but yield fully consistent measurements of the interstellar He flow properties, further validating our findings. While detailed error bars are given for both approaches, we recommend that for most purposes, the community use “working values” of ~25.4 km s⁻¹, ~75°7 ecliptic inflow longitude, ~−5°1 ecliptic inflow latitude, and ~7500 K temperature at ~1000 AU upstream. Finally, we briefly address future opportunities for even better interstellar neutral observations to be provided by the Interstellar Mapping and Acceleration Probe mission, which was recommended as the next major Heliophysics mission by the NRCʼs 2013 Decadal Survey.

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Galli, André and Wurz, Peter


500 Science > 530 Physics




Institute of Physics Publishing IOP




Katharina Weyeneth-Moser

Date Deposited:

13 Jun 2016 16:44

Last Modified:

10 Sep 2017 20:23

Publisher DOI:


Web of Science ID:






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