The Influence of Polar Coronal Holes on the Polar ENA Flux Observed by IBEX

Reisenfeld, Daniel Brett; Bzowski, Maciej; Funsten III, Herbert O.; Janzen, Paul H.; Karna, Nishu; Kubiak, Marzena A.; McComas, David J.; Schwadron, Nathan A.; Sokół, Justyna M.

doi:10.3847/1538-4357/ab22c0

Title: The Influence of Polar Coronal Holes on the Polar ENA Flux Observed by IBEX

Journal Article · Wed Jun 26 00:00:00 EDT 2019 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/ab22c0· OSTI ID:1601396

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Polish Academy of Sciences (CBK PAN), Warsaw (Poland). Space Research Centre
Univ. of Montana, Missoula, MT (United States)
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
Princeton Univ., NJ (United States)
Univ. of New Hampshire, Durham, NH (United States). Space Science Center

Polar coronal holes (PCHs) fill the high-latitude heliosphere with fast solar wind during the minimum phase of the solar cycle. This leads to a hardening of the energy spectrum of the proton plasma in the inner heliosheath (IHS), observed as energetic neutral atoms (ENAs) by the Interstellar Boundary Explorer (IBEX). In particular, the highest-energy channel of the IBEX-Hi instrument (at 4.3 keV) is a very sensitive indicator of pretermination shock fast wind entering the IHS. Herein, we show that the 4.3 keV ENA flux observed from the ecliptic poles is well correlated with the area of the solar surface covered by PCHs throughout the solar cycle, which demonstrates the existence of a direct connection between coronal structure and the dynamic properties of the IHS.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA); National Science Centre of Poland (NCN)

Grant/Contract Number:: 89233218CNA000001; 2015-18-M-ST9-00036

OSTI ID:: 1601396

Report Number(s):: LA-UR-19-22264; TRN: US2103636

Journal Information:: The Astrophysical Journal (Online), Vol. 879, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Cited By (2)

An Empirical Model of Energetic Neutral Atom Imaging of the Heliosphere and Its Implications for Future Heliospheric Missions at Great Heliocentric Distances Galli, A.; Wurz, P.; Fichtner, H. The Astrophysical Journal, Vol. 886, Issue 1 https://doi.org/10.3847/1538-4357/ab4e94	journal	November 2019
An Empirical Model of Energetic Neutral Atom Imaging of the Heliosphere and Its Implications for Future Heliospheric Missions at Great Heliocentric Distances Galli, André; Wurz, Peter; Fichtner, H. Institute of Physics Publishing IOP https://doi.org/10.7892/boris.139298	text	January 2019

Figures / Tables (3)

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