Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/28389
DC Field | Value | Language |
---|---|---|
dc.contributor.author | BONANNO, Alfio Maurizio | en_US |
dc.contributor.author | DEL SORDO, FABIO | en_US |
dc.date.accessioned | 2020-11-17T16:11:26Z | - |
dc.date.available | 2020-11-17T16:11:26Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/28389 | - |
dc.description.abstract | Context. Stellar dynamos are affected by boundary conditions imposed by stellar coronae. Under some approximations, it is possible to find analytical solutions. Interior dynamo models often consider a current-free corona without taking into account the constraints imposed by the presence of currents in the corona. <BR /> Aims: We aim to analytically evaluate the effect of coronal currents and of an outer boundary condition on the efficiency of an α<SUP>2</SUP> dynamo. We intend to estimate the change in geometry and dynamo excitation numbers with respect to the current-free case. <BR /> Methods: We analytically solved the turbulent dynamo induction equation for a homogeneous, non-mirror symmetric turbulence in a spherical domain surrounded by a linear force-free corona with the mean magnetic field B satisfying ∇ × B = βB. <BR /> Results: The dynamo number is a decreasing function of β. Moreover, if the current is parallel to the field (β > 0), the dynamo number is smaller than in the force-free case. In contrast, for (β < 0), the dynamo number is greater than in the force-free case. Conclusions: Currents in the corona need to be taken into account because they affect the condition for excitation of a dynamo. | en_US |
dc.language.iso | eng | en_US |
dc.title | Analytic mean-field α^2-dynamo with a force-free corona | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201731330 | en_US |
dc.identifier.scopus | 2-s2.0-85028914380 | en_US |
dc.identifier.isi | 000412231200099 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2017/09/aa31330-17/aa31330-17.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 605 | en_US |
dc.relation.firstpage | A33 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 2 | en_US |
dc.description.international | no | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017A&A...605A..33B | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Catania | - |
crisitem.author.orcid | 0000-0003-3175-9776 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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