Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Analytic solution of an oscillatory migratory alpha(2) stellar dynamo
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). University of Colorado, USA.ORCID-id: 0000-0002-7304-021X
Rekke forfattare: 12017 (engelsk)Inngår i: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 598, artikkel-id A117Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Context. Analytic solutions of the mean-field induction equation predict a nonoscillatory dynamo for homogeneous helical turbulence or constant alpha effect in unbounded or periodic domains. Oscillatory dynamos are generally thought impossible for constant alpha.

Aims. We present an analytic solution for a one-dimensional bounded domain resulting in oscillatory solutions for constant alpha, but different (Dirichlet and von Neumann or perfect conductor and vacuum) boundary conditions on the two boundaries.

Methods. We solve a second order complex equation and superimpose two independent solutions to obey both boundary conditions.

Results. The solution has time-independent energy density. On one end where the function value vanishes, the second derivative is finite, which would not be correctly reproduced with sine-like expansion functions where a node coincides with an inflection point. The field always migrates away from the perfect conductor boundary toward the vacuum boundary, independently of the sign of alpha.

Conclusions. The obtained solution may serve as a benchmark for numerical dynamo experiments and as a pedagogical illustration that oscillatory migratory dynamos are possible with constant alpha.

sted, utgiver, år, opplag, sider
2017. Vol. 598, artikkel-id A117
Emneord [en]
dynamo, magnetohydrodynamics (MHD), magnetic fields, Sun: magnetic fields, stars: magnetic field
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-142520DOI: 10.1051/0004-6361/201630033ISI: 000394465000116OAI: oai:DiVA.org:su-142520DiVA, id: diva2:1094281
Tilgjengelig fra: 2017-05-09 Laget: 2017-05-09 Sist oppdatert: 2022-02-28bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekst

Person

Brandenburg, Axel

Søk i DiVA

Av forfatter/redaktør
Brandenburg, Axel
Av organisasjonen
I samme tidsskrift
Astronomy and Astrophysics

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 45 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf