Fuselier, S. A.; Galli, A.; Richardson, J. D.; Reisenfeld, D. B.; Zirnstein, E. J.; Heerikhuisen, J.; Dayeh, M. A.; Schwadron, N. A.; McComas, D. J.; Elliott, H. A.; Gomez, R. G.; Starkey, M. J.; Kornbleuth, M. Z.; Opher, M.; Dialynas, K. (2021). Energetic Neutral Atom Fluxes from the Heliosheath: Constraints from in situ Measurements and Models. Astrophysical Journal Letters, 915(2), L26. Institute of Physics Publishing IOP 10.3847/2041-8213/ac0d5c
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Voyager 2 observations throughout the heliosheath from the termination shock to the heliopause are used to normalize and constrain model pickup ion (PUI) fluxes. Integrating normalized PUI fluxes along the Voyager 2 trajectory through the heliosheath, and combining these integral fluxes with the energy-dependent charge-exchange cross section and the neutral hydrogen density, produces semi-empirical estimates of the energetic neutral atom (ENA) fluxes from the heliosheath. These estimated ENA fluxes are compared with observed ENA fluxes from the Interstellar Boundary Explorer (IBEX) to determine what percentage of the observed fluxes at each IBEX energy are from the heliosheath. These percentages are a maximum of ∼10% for most energies and depend strongly on termination shock properties, plasma density, bulk plasma flow characteristics, the shape of the heliopause, and turbulent energy diffusion in the heliosheath.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences 08 Faculty of Science > Physics Institute |
UniBE Contributor: |
Galli, A |
Subjects: |
500 Science > 520 Astronomy 600 Technology > 620 Engineering 500 Science > 530 Physics |
ISSN: |
2041-8205 |
Publisher: |
Institute of Physics Publishing IOP |
Language: |
English |
Submitter: |
Dora Ursula Zimmerer |
Date Deposited: |
10 Aug 2021 14:10 |
Last Modified: |
05 Dec 2022 15:52 |
Publisher DOI: |
10.3847/2041-8213/ac0d5c |
BORIS DOI: |
10.48350/157947 |
URI: |
https://boris.unibe.ch/id/eprint/157947 |