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dc.contributor.authorPucci, Stefano
dc.contributor.authorLie-Svendsen, Øystein
dc.contributor.authorEsser, Ruth
dc.date.accessioned2014-04-08T12:09:38Z
dc.date.available2014-04-08T12:09:38Z
dc.date.issued2010
dc.description.abstractWe carry out a model study to determine whether a funnel-type flow geometry in the solar wind source region leads to sufficiently fast hydrogen flow to offset heavy element gravitational settling and can thus explain why solar wind abundances are not much smaller than photospheric abundances. We find that high first ionization potential (FIP) elements are more susceptible to gravitational settling than low-FIP elements, which are pulled up by Coulomb drag from protons, and hence the settling is more sensitive to the charge state of the elements than to their mass. Abundances at the top of the chromosphere, and hence solar wind abundances, can change by many orders of magnitude when the funnel areal expansion factor is changed by a small amount. The observed solar wind neon abundance provides the most severe constraint on the expansion, requiring a total flux tube expansion factor of at least 30-40.en
dc.identifier.citationThe Astrophysical Journal 709(2010) nr. 2 s. 993-1002en
dc.identifier.cristinIDFRIDAID 340193
dc.identifier.doihttp://dx.doi.org/10.1088/0004-637X/709/2/993
dc.identifier.issn0004-637X
dc.identifier.urihttps://hdl.handle.net/10037/6160
dc.identifier.urnURN:NBN:no-uit_munin_5848
dc.language.isoengen
dc.publisherUniversity of Chicago Pressen
dc.rights.accessRightsopenAccess
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437en
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438en
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438en
dc.titleElemental Abundances in the Fast Solar Wind Emanating from Chromospheric Funnelsen
dc.typeJournal articleen
dc.typeTidsskriftartikkelen
dc.typePeer revieweden


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