Energetic neutral atoms measured by the interstellar boundary explorer (IBEX): evidence for multiple heliosheath populations

Desai, M. I.; Allegrini, F. A.; Bzowski, M.; Dayeh, M. A.; Funsten, H.; Fuselier, S. A.; Heerikhuisen, J.; Kubiak, M. A.; McComas, D. J.; Pogorelov, N. V.; Schwadron, N. A.; Sokół, J. M.; Zank, G. P.; Zirnstein, E. J.

doi:10.1088/0004-637X/780/1/98

Energetic neutral atoms measured by the interstellar boundary explorer (IBEX): evidence for multiple heliosheath populations

Journal Article · Fri Dec 13 00:00:00 EST 2013 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/780/1/98· OSTI ID:1326045

Desai, M. I. ^[1]; Allegrini, F. A. ^[2]; Bzowski, M. ^[3]; Dayeh, M. A. ^[4]; Funsten, H. ^[5]; Fuselier, S. A. ^[4]; Heerikhuisen, J. ^[6]; Kubiak, M. A. ^[3]; McComas, D. J. ^[2]; Pogorelov, N. V. ^[6]; Schwadron, N. A. ^[7]; Sokół, J. M. ^[3]; Zank, G. P. ^[6]; Zirnstein, E. J. ^[6]

Southwest Research Inst. (SwRI), San Antonio, TX (United States); Univ. of Texas at San Antonio, San Antonio, TX (United States). Dept. of Physics and Astronomy; University of Alabama in Huntsville
Southwest Research Inst. (SwRI), San Antonio, TX (United States); Univ. of Texas at San Antonio, San Antonio, TX (United States). Dept. of Physics and Astronomy
Space Research Centre, Warsaw (Poland). Inst. of Physics (PAS)
Southwest Research Inst. (SwRI), San Antonio, TX (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Alabama in Huntsville, AL (United States). Center for Space Plasma and Aeronomic Research (CSPAR)
Univ. of New Hampshire, Durham, NH (United States). Space Science Center, Dept. of Physics

Energetic neutral atoms (ENAs) observed by the Interstellar Boundary Explorer (IBEX) provide powerful diagnostics about the origin of the progenitor ion populations and the physical mechanisms responsible for their production. In this paper, we extend the work of Desai et al. and Fuselier et al. and combine and compare ENA spectra from the first 3 yr of observations by the IBEX-Hi and -Lo ENA imagers along the lines-of-sight (LOSs) from the inner heliosphere through to the locations of Voyager 1 and 2 with results from an updated physics-based model of the three-dimensional heliosphere and its constituent ion populations. Our results show that (1) IBEX ENA fluxes and spectra above ~0.7 keV measured along the LOSs of the Voyagers are consistent with several models in which the parent pickup ion (PUI) populations originate in the inner heliosheath, and (2) a significant fraction of lower energy ENAs between ~0.1-0.5 keV may originate from interstellar neutral gas charge-exchanging with a non-thermalized (hot) population of PUIs in the outer heliosheath beyond the heliopause. Here we discuss the implications of ENAs observed by IBEX originating from distinct parent populations as well as from two distinct locations in the heliospheric interface. In conclusion, these results indicate that ENA spectral measurements at various energies can be used to remotely probe distinct physical processes operating in vastly different regions of the distant heliosphere.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Alabama in Huntsville, AL (United States)

Sponsoring Organization:: Polish National Science Center; USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24): NASA

Grant/Contract Number:: SC0008334

OSTI ID:: 1326045

Alternate ID(s):: OSTI ID: 22348313

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 780; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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