The Plasma Pressure Contribution from Low-energy (0.05-2 keV) Energetic Neutral Atoms in the Heliosheath

André Galli; Peter Wurz; Nathan A. Schwadron; Eberhard Möbius; Stephen A. Fuselier; Justyna M. Sokół; Paweł Swaczyna; Maciej Bzowski; David J. McComas

doi:10.3847/1538-4357/ad6150

The Plasma Pressure Contribution from Low-energy (0.05-2 keV) Energetic Neutral Atoms in the Heliosheath

André Galli, Peter Wurz, Nathan A. Schwadron, Eberhard Möbius, Stephen A. Fuselier, Justyna M. Sokół, Paweł Swaczyna, Maciej Bzowski, David J. McComas

Astrophysical Sciences

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Abstract

Energetic neutral atoms (ENAs) from the heliosphere are a unique means to remotely image the boundary regions of our heliosphere. The Interstellar Boundary Explorer (IBEX) has been very successful in measuring these ENAs since 2008 at energies from tens of eV to 6 keV. The main question raised by one solar cycle of IBEX-Lo observations at 0.05-2 keV is the strong and ubiquitous underestimation of several model predictions compared with actually measured ENA intensities at energies between 100 and 500 eV. This study converts the observed ENA intensities into plasma pressures for different sky directions and considers the implications for our understanding of the heliosheath and the source of the observed ENAs.

Original language	English (US)
Article number	2
Journal	Astrophysical Journal
Volume	971
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ad6150
State	Published - Aug 1 2024

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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title = "The Plasma Pressure Contribution from Low-energy (0.05-2 keV) Energetic Neutral Atoms in the Heliosheath",

abstract = "Energetic neutral atoms (ENAs) from the heliosphere are a unique means to remotely image the boundary regions of our heliosphere. The Interstellar Boundary Explorer (IBEX) has been very successful in measuring these ENAs since 2008 at energies from tens of eV to 6 keV. The main question raised by one solar cycle of IBEX-Lo observations at 0.05-2 keV is the strong and ubiquitous underestimation of several model predictions compared with actually measured ENA intensities at energies between 100 and 500 eV. This study converts the observed ENA intensities into plasma pressures for different sky directions and considers the implications for our understanding of the heliosheath and the source of the observed ENAs.",

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month = aug,

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doi = "10.3847/1538-4357/ad6150",

language = "English (US)",

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T1 - The Plasma Pressure Contribution from Low-energy (0.05-2 keV) Energetic Neutral Atoms in the Heliosheath

AU - Galli, André

AU - Wurz, Peter

AU - Schwadron, Nathan A.

AU - Möbius, Eberhard

AU - Fuselier, Stephen A.

AU - Sokół, Justyna M.

AU - Swaczyna, Paweł

AU - Bzowski, Maciej

AU - McComas, David J.

PY - 2024/8/1

Y1 - 2024/8/1

N2 - Energetic neutral atoms (ENAs) from the heliosphere are a unique means to remotely image the boundary regions of our heliosphere. The Interstellar Boundary Explorer (IBEX) has been very successful in measuring these ENAs since 2008 at energies from tens of eV to 6 keV. The main question raised by one solar cycle of IBEX-Lo observations at 0.05-2 keV is the strong and ubiquitous underestimation of several model predictions compared with actually measured ENA intensities at energies between 100 and 500 eV. This study converts the observed ENA intensities into plasma pressures for different sky directions and considers the implications for our understanding of the heliosheath and the source of the observed ENAs.

AB - Energetic neutral atoms (ENAs) from the heliosphere are a unique means to remotely image the boundary regions of our heliosphere. The Interstellar Boundary Explorer (IBEX) has been very successful in measuring these ENAs since 2008 at energies from tens of eV to 6 keV. The main question raised by one solar cycle of IBEX-Lo observations at 0.05-2 keV is the strong and ubiquitous underestimation of several model predictions compared with actually measured ENA intensities at energies between 100 and 500 eV. This study converts the observed ENA intensities into plasma pressures for different sky directions and considers the implications for our understanding of the heliosheath and the source of the observed ENAs.

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The Plasma Pressure Contribution from Low-energy (0.05-2 keV) Energetic Neutral Atoms in the Heliosheath

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