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Title: Modeling Emission of Heavy Energetic Neutral Atoms from the Heliosphere

Abstract

Observations of energetic neutral atoms (ENAs) are a fruitful tool for remote diagnosis of the plasma in the heliosphere and its vicinity. So far, instruments detecting ENAs from the heliosphere were configured for observations of hydrogen atoms. Here, we estimate emissions of ENAs of the heavy chemical elements helium, oxygen, nitrogen, and neon. A large portion of the heliospheric ENAs is created in the inner heliosheath from neutralized interstellar pick-up ions (PUIs). We modeled this process and calculated full-sky intensities of ENAs for energies 0.2–130 keV/nuc. We found that the largest fluxes among considered species are expected for helium, smaller for oxygen and nitrogen, and smallest for neon. The obtained intensities are 50–10{sup 6} times smaller than the hydrogen ENA intensities observed by IBEX . The detection of heavy ENAs will be possible if a future ENA detector is equipped with the capability to measure the masses of observed atoms. Because of different reaction cross-sections among the different species, observations of heavy ENAs can allow for a better understanding of global structure of the heliosphere as well as the transport and energization of PUIs in the heliosphere.

Authors:
;  [1]
  1. Space Research Centre of the Polish Academy of Sciences (CBK PAN), Bartycka 18A, 00-716 Warsaw (Poland)
Publication Date:
OSTI Identifier:
22679865
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 846; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ATOMS; CROSS SECTIONS; DETECTION; ELEMENT ABUNDANCE; EMISSION; HELIOSPHERE; HELIUM; HYDROGEN; IONS; KEV RANGE; MASS; NEON; NITROGEN; OXYGEN; PLASMA; SIMULATION; SOLAR WIND; SPACE; SPACE VEHICLES; SUN

Citation Formats

Swaczyna, Paweł, and Bzowski, Maciej, E-mail: pswaczyna@cbk.waw.pl. Modeling Emission of Heavy Energetic Neutral Atoms from the Heliosphere. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA862B.
Swaczyna, Paweł, & Bzowski, Maciej, E-mail: pswaczyna@cbk.waw.pl. Modeling Emission of Heavy Energetic Neutral Atoms from the Heliosphere. United States. doi:10.3847/1538-4357/AA862B.
Swaczyna, Paweł, and Bzowski, Maciej, E-mail: pswaczyna@cbk.waw.pl. Sun . "Modeling Emission of Heavy Energetic Neutral Atoms from the Heliosphere". United States. doi:10.3847/1538-4357/AA862B.
@article{osti_22679865,
title = {Modeling Emission of Heavy Energetic Neutral Atoms from the Heliosphere},
author = {Swaczyna, Paweł and Bzowski, Maciej, E-mail: pswaczyna@cbk.waw.pl},
abstractNote = {Observations of energetic neutral atoms (ENAs) are a fruitful tool for remote diagnosis of the plasma in the heliosphere and its vicinity. So far, instruments detecting ENAs from the heliosphere were configured for observations of hydrogen atoms. Here, we estimate emissions of ENAs of the heavy chemical elements helium, oxygen, nitrogen, and neon. A large portion of the heliospheric ENAs is created in the inner heliosheath from neutralized interstellar pick-up ions (PUIs). We modeled this process and calculated full-sky intensities of ENAs for energies 0.2–130 keV/nuc. We found that the largest fluxes among considered species are expected for helium, smaller for oxygen and nitrogen, and smallest for neon. The obtained intensities are 50–10{sup 6} times smaller than the hydrogen ENA intensities observed by IBEX . The detection of heavy ENAs will be possible if a future ENA detector is equipped with the capability to measure the masses of observed atoms. Because of different reaction cross-sections among the different species, observations of heavy ENAs can allow for a better understanding of global structure of the heliosphere as well as the transport and energization of PUIs in the heliosphere.},
doi = {10.3847/1538-4357/AA862B},
journal = {Astrophysical Journal},
number = 2,
volume = 846,
place = {United States},
year = {Sun Sep 10 00:00:00 EDT 2017},
month = {Sun Sep 10 00:00:00 EDT 2017}
}