CAN IBEX DETECT INTERSTELLAR NEUTRAL HELIUM OR OXYGEN FROM ANTI-RAM DIRECTIONS?

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dc.contributor.authorGalli, A.
dc.contributor.authorWurz, P.
dc.contributor.authorPark, Jeewoo
dc.contributor.authorKucharek, H.
dc.contributor.authorMöbius, E.
dc.contributor.authorSchwadron, N. A.
dc.contributor.authorSokół, J. M.
dc.contributor.authorBzowski, M.
dc.contributor.authorKubiak, M. A.
dc.contributor.authorSwaczyna, P.
dc.contributor.authorFuselier, S. A.
dc.contributor.authorMcComas, D. J.
dc.date.accessioned2025-10-22T19:58:00Z
dc.date.issued2015-10-20
dc.description.abstractTo better constrain the parameters of the interstellar neutral flow, we searched the Interstellar Boundary EXplorer (IBEX)-Lo database for helium and oxygen from the interstellar medium in the anti-ram direction in the three years (2009–2011) with the lowest background rates. We found that IBEX-Lo cannot observe interstellar helium from the anti-ram direction because the helium energy is too low for indirect detection by sputtering off the IBEX-Lo conversion surface. Our results show that this sputtering process has a low energy threshold between 25 and 30 eV, whereas the energy of the incident helium is only 10 eV for these observations. Interstellar oxygen, on the other hand, could in principle be detected in the anti-ram hemisphere, but the expected magnitude of the signal is close to the detection limit imposed by counting statistics and by the magnetospheric foreground.
dc.description.sponsorshipWe thank all of the outstanding men and women who have made the IBEX mission such a wonderful success. A.G. and P. W. thank the Swiss National Science foundation for financial support. M.B., M.A.K., J.M.S., and P.S. were supported by Polish National Science Center grant 2012-06-M-ST9-00455. J.P., H.K., E.M., N.S., S.A.F., and D.J.M. were supported by the NASA Explorer program as a part of the IBEX mission
dc.description.urihttps://iopscience.iop.org/article/10.1088/0067-0049/220/2/30/meta
dc.format.extent13 pages
dc.genrejournal articles
dc.identifierdoi:10.13016/m2nuwv-5iho
dc.identifier.citationGalli, A., P. Wurz, J. Park, et al. “CAN IBEX DETECT INTERSTELLAR NEUTRAL HELIUM OR OXYGEN FROM ANTI-RAM DIRECTIONS?” The Astrophysical Journal Supplement Series 220, no. 2 (2015): 30. https://doi.org/10.1088/0067-0049/220/2/30.
dc.identifier.urihttp://doi.org/10.1088/0067-0049/220/2/30
dc.identifier.urihttp://hdl.handle.net/11603/40531
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Goddard Planetary Heliophysics Institute (GPHI)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.titleCAN IBEX DETECT INTERSTELLAR NEUTRAL HELIUM OR OXYGEN FROM ANTI-RAM DIRECTIONS?
dc.typeText
dcterms.creatorhttps://orcid.org/0000-0002-8989-4631

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