Energetic Neutral Atom Fluxes from the Heliosheath: Constraints from in situ Measurements and Models

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

[img] Text
Fuselier_2021_ApJL_915_L26.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (963kB)

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)

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

Actions (login required)

Edit item Edit item
Provide Feedback