Dependence of the IBEX Ribbon Geometry on Pitch-Angle Scattering outside the Heliopause

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dc.contributor.advisor
dc.contributor.authorZirnstein, E. J.en_NZ
dc.contributor.authorDayeh, M. A.en_NZ
dc.contributor.authorHeerikhuisen, J.en_NZ
dc.date.accessioned2023-02-26T20:45:47Z
dc.date.available2023-02-26T20:45:47Z
dc.date.issued2021-02-01en_NZ
dc.description.abstractInterstellar Boundary Explorer (IBEX) observations of the “ribbon” of enhanced energetic neutral atom (ENA) fluxes show that it is a persistent feature that approximately forms a circle in the sky, likely formed from secondary ENAs whose source lies outside the heliopause. The IBEX ribbonʼsgeometry(radius and center) depends on ENA energy and is believed to be influenced by the draping of the ISMF and the latitudinal structure of the SW. In this study, we demonstrate that the ribbonʼs geometry also depends on the pitch-angle scattering rate of ions outside the heliopause, which we simulate under strong and weak-scattering limits. The ribbon radius in the weak-scattering model is ∼4° larger than IBEX observations at most energies, and the strong-scattering model produces radii statistically consistent with IBEX at 1.1–2.7 keV. The simulated ribbon center is shifted between ∼2° and 5° along the B–V plane away from the IBEX center for the weak and strong limits, respectively, suggesting that the pristine ISMF far from the heliosphere is shifted ∼2°–5° away from our simulated ISMF toward the VLISM inflow direction. However, the magnitude needs to be decreased from ∼3to2μG for the weak-scattering model to be consistent with the IBEX ribbon radius, which seems unlikely. We also f ind that the presence of interstellar He does not significantly affect the ribbon in the strong-scattering limit but yields weaker agreement with data in the weak limit. Our results slightly favor the strong-scattering limit for the ribbonʼs origin.
dc.format.mimetypeapplication/pdf
dc.identifier.doi10.3847/1538-4357/abd4e8en_NZ
dc.identifier.eissn1538-4357en_NZ
dc.identifier.issn0004-637Xen_NZ
dc.identifier.urihttps://hdl.handle.net/10289/15581
dc.language.isoEnglishen_NZ
dc.publisherIOP PUBLISHING LTDen_NZ
dc.relation.isPartOfASTROPHYSICAL JOURNALen_NZ
dc.rights© 2021. This work is licensed under a CC BY 4.0 license.
dc.subjectScience & Technologyen_NZ
dc.subjectPhysical Sciencesen_NZ
dc.subjectAstronomy & Astrophysicsen_NZ
dc.subjectHeliosphereen_NZ
dc.subjectSolar winden_NZ
dc.subjectPickup ionsen_NZ
dc.subjectInterstellar mediumen_NZ
dc.subjectHeliosheathen_NZ
dc.subjectInterstellar magnetic fieldsen_NZ
dc.titleDependence of the IBEX Ribbon Geometry on Pitch-Angle Scattering outside the Heliopauseen_NZ
dc.typeJournal Article
pubs.elements-id259573
pubs.issue1en_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/2026 PBRF
pubs.organisational-group/Waikato/DHECS
pubs.organisational-group/Waikato/DHECS/2026 PBRF - DHEC
pubs.organisational-group/Waikato/DHECS/SCMS
pubs.organisational-group/Waikato/DHECS/SCMS/2026 PBRF - SCMS
pubs.publication-statusPublisheden_NZ
pubs.user.infoHeerikhuisen, Jacob (jacob.heerikhuisen@waikato.ac.nz)
pubs.volume908en_NZ
uow.identifier.article-noARTN 35
uow.verification.statusverified
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