Application of collisional analysis to the differential velocity of solar wind ions

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Author(s)Johnson, E.
Author(s)Maruca, B. A.
Author(s)McManus, M.
Author(s)Stevens, M.
Author(s)Klein, K. G.
Author(s)Mostafavi, P.
Date Accessioned2024-02-21T19:07:48Z
Date Available2024-02-21T19:07:48Z
Publication Date2024-01-09
DescriptionThis article was originally published in Frontiers in Astronomy and Space Sciences. The version of record is available at: https://doi.org/10.3389/fspas.2023.1284913. © 2024 Johnson, Maruca, McManus, Stevens, Klein and Mostafavi.
AbstractCollisional analysis combines the effects of collisional relaxation and large-scale expansion to quantify how solar wind parameters evolve as the plasma expands through the heliosphere. Though previous studies have applied collisional analysis to the temperature ratio between protons (ionized hydrogen) and α-particles (fully ionized helium), this is the first study to explore α-proton differential flow with collisional analysis. First, the mathematical model for the collisional analysis of differential flow was derived. Then, this model was applied to individual in-situ observations from Parker Solar Probe (PSP; r = 0.1–0.27 au) to generate predictions of the α-proton differential flow in the near-Earth solar wind. A comparison of these predicted values with contemporaneous measurements from the Wind spacecraft (r = 1.0 au) shows strong agreement, which may imply that the effects of expansion and Coulomb collisions have a large role in governing the evolution of differential flow through the inner heliosphere.
SponsorThe author(s) declare that no financial support was received for the research, authorship, and/or publication of this article. EJ and BAM are partially supported by the NSF Award No. 1931435. This research made use of PlasmaPy, a community-developed open-source Python package for plasma science PlasmaPy (2021).
CitationJohnson E, Maruca BA, McManus M, Stevens M, Klein KG and Mostafavi P (2024) Application of collisional analysis to the differential velocity of solar wind ions. Front. Astron. Space Sci. 10:1284913. doi: 10.3389/fspas.2023.1284913
ISSN2296-987X
URLhttps://udspace.udel.edu/handle/19716/34006
Languageen_US
PublisherFrontiers in Astronomy and Space Sciences
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
Keywordssolar wind
Keywordsplasma
Keywordscollision physics
KeywordsCoulomb collisions
Keywordsdifferential flow
KeywordsSun
Keywordsheliosphere
TitleApplication of collisional analysis to the differential velocity of solar wind ions
TypeArticle
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