2023
DOI: 10.3847/1538-4357/acb437
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Relating Energetic Ion Spectra to Energetic Neutral Atoms

Abstract: Heliospheric energetic neutral atoms (ENAs) originate from energetic ions that are neutralized by charge exchange with neutral atoms in the heliosheath and very local interstellar medium (VLISM). Since neutral atoms are unaffected by electromagnetic fields, they propagate ballistically with the same speeds as parent particles. Consequently, measurements of ENA distributions allow one to remotely image the energetic ion distributions in the heliosheath and VLISM. The origin of the energetic ions that spawn ENAs… Show more

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Cited by 8 publications
(9 citation statements)
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“…We assume a Maxwellian distribution for the transmitted and reflected PUIs, which are PUI populations energized to ∼1-3 keV and ∼3-5 keV, respectively, at the termination shock (Zank et al 2010). We also model a PUI population, accelerated at the termination shock via diffusive shock acceleration, using a power-law distribution function (Wang et al 2023):…”
Section: Ena Modelmentioning
confidence: 99%
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“…We assume a Maxwellian distribution for the transmitted and reflected PUIs, which are PUI populations energized to ∼1-3 keV and ∼3-5 keV, respectively, at the termination shock (Zank et al 2010). We also model a PUI population, accelerated at the termination shock via diffusive shock acceleration, using a power-law distribution function (Wang et al 2023):…”
Section: Ena Modelmentioning
confidence: 99%
“…Additionally, v is the individual particle velocity, and v l and v m are the minimum and maximum velocities for particle acceleration at the termination shock. The detailed derivation and discussion of Equation (1) can be found in Wang et al (2023).…”
Section: Ena Modelmentioning
confidence: 99%
See 1 more Smart Citation
“…The energy partition was used to obtain the PUI properties from the plasma mixture instead of solving the equations describing the PUI behavior self-consistently. Recently, Kornbleuth et al (2023) have used the hybrid simulations of Giacalone et al (2021) and the theoretical analysis of Wang et al (2023) to investigate the effect of diffusive shock acceleration on the PUI transmission through the TS in the framework of a global model, which did not include PUIs separately. In addition, rather strong assumptions were made to extrapolate or deduce the properties of PUIs across the entire TS surface and the IHS, with the purpose of fitting the IBEX and Cassini INCA measurements of ENA fluxes in the energy range up to 40 keV.…”
Section: Treatment Of Puis Across the Termination Shockmentioning
confidence: 99%
“…The multiply reflected PUI spectra can be approximated by a power-law distribution (Zank et al 1996;Lipatov et al 1998;Rice et al 2001). Part of the reflected PUI population could be further accelerated by the DSA process (Wang et al 2023) provided that the particle speed is above the injection energy. The injection problem in the theory of shock acceleration is still under debate (Giacalone & Jokipii 1999;Zank et al 2001Zank et al , 2006Giacalone 2012;Giacalone et al 2022;Perri et al 2022).…”
Section: Introductionmentioning
confidence: 99%