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dc.contributor.authorEsser, Ruth
dc.contributor.authorLie-Svendsen, Øystein
dc.contributor.authorJanse, Åse Marit
dc.contributor.authorKillie, Mari Anne
dc.date.accessioned2017-11-11T09:28:35Z
dc.date.available2017-11-11T09:28:35Z
dc.date.issued2005-08-10
dc.description.abstractUsing a newly developed gyrotropic solar wind model that extends continuously from the mid-chromosphere to 1 AU and that accounts for radiative losses in the transition region, we have studied the difference between the fast solar wind emanating from a funnel geometry and a ``traditional'' rapidly expanding wind. The main aim is to determine whether or not observations of the Lyalpha intensity in the low transition region can be reconciled with solar wind models. In a rapidly expanding geometry, we are not able to produce a Lyalpha intensity much higher than 1/10 of the observed values without creating a large pressure in the transition region and, as a result, a mass flux much higher than observed. In a funnel, on the other hand, we can easily obtain the observed Lyalpha intensity, while still having a wind solution in agreement with observations. The main reason for this is that the fast flow in the funnel causes hydrogen to be very far from ionization equilibrium, with the Lyalpha intensity coming from temperatures of about 5×10^4 K. At these elevated temperatures, the radiative loss is much more efficient. The results of this Letter support the idea that the solar wind originates from small coronal funnels.en_US
dc.descriptionSource at <a href=https://doi.org/10.1086/444497> https://doi.org/10.1086/444497 </a>en_US
dc.identifier.citationEsser R, Lie-Svendsen Ø, Janse ÅM, Killie MA. Solar Wind from Coronal Funnels and Transition Region Lyalpha. The Astrophysical Journal. 2005;629(1):L61-L64en_US
dc.identifier.cristinIDFRIDAID 405233
dc.identifier.doi10.1086/444497
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.urihttps://hdl.handle.net/10037/11725
dc.language.isoengen_US
dc.publisherAmerican Astronomical Societyen_US
dc.relation.journalThe Astrophysical Journal
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SUPKUF/146467/NORWAY/Solar and Heliospheric Plasmas /SHP/en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437en_US
dc.titleSolar Wind from Coronal Funnels and Transition Region Lyalphaen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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