2021
DOI: 10.3847/1538-4365/abee76
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Interstellar Pickup Ion Observations Halfway to the Termination Shock

Abstract: In this study, we extend the prior interstellar pickup ion (PUI) observations from the Solar Wind Around Pluto (SWAP) instrument on New Horizons out to nearly 47 au—essentially halfway to the termination shock in the upwind direction. We also provide significantly improved analyses of these and prior observations, including incorporating a cooling index, α, to characterize the nonadiabatic heating of PUI distributions. We find that the vast majority (93.6%) of all distributions show additional heating above ad… Show more

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Cited by 45 publications
(98 citation statements)
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References 79 publications
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“… 2013 , 2012 ), quantifying the nonthermal distribution of PUIs in the solar wind plasma and their radial trend from where the instrument was permitted to stay on nearly continuously, out to roughly halfway to the HTS (McComas et al. 2021 ). This section reviews the history of SWAP observations of interstellar PUIs, their distribution function, radial trends, interactions with interplanetary shocks, and their properties extrapolated to the HTS.…”
Section: Observations Of Interstellar Puis In the Outer Heliospherementioning
confidence: 99%
See 4 more Smart Citations
“… 2013 , 2012 ), quantifying the nonthermal distribution of PUIs in the solar wind plasma and their radial trend from where the instrument was permitted to stay on nearly continuously, out to roughly halfway to the HTS (McComas et al. 2021 ). This section reviews the history of SWAP observations of interstellar PUIs, their distribution function, radial trends, interactions with interplanetary shocks, and their properties extrapolated to the HTS.…”
Section: Observations Of Interstellar Puis In the Outer Heliospherementioning
confidence: 99%
“… 2014 ; McComas et al. 2021 ) where is the cooling index, is the interstellar neutral H density at the HTS (Swaczyna et al. 2020 ), and is the survival probability of PUIs from their point of creation to the point of observation.…”
Section: Observations Of Interstellar Puis In the Outer Heliospherementioning
confidence: 99%
See 3 more Smart Citations