Can IBEX detect interstellar neutral helium or oxygen from anti-ram directions?

Galli, André; Wurz, Peter; Park, J.; Kucharek, H.; Moebius, E.; Schwadron, N. A.; Sokol, J. M.; Bzowski, M.; Kubiak, M. A.; Swaczyna, P.; Fuselier, S. A.; McComas, D. J. (2015). Can IBEX detect interstellar neutral helium or oxygen from anti-ram directions? Astrophysical journal - supplement series, 220(2), p. 30. Institute of Physics Publishing IOP 10.1088/0067-0049/220/2/30

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To 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Galli, André and Wurz, Peter

Subjects:

500 Science > 530 Physics

ISSN:

0067-0049

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Katharina Weyeneth-Moser

Date Deposited:

14 Jun 2016 13:53

Last Modified:

18 Jul 2016 16:41

Publisher DOI:

10.1088/0067-0049/220/2/30

Web of Science ID:

000366384900009

BORIS DOI:

10.7892/boris.81659

URI:

https://boris.unibe.ch/id/eprint/81659

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