Magnetic concentrations in stratified turbulence: The negative effective magnetic pressure instability

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Abstract

In the presence of strong density stratification, hydromagnetic turbulence attains qualitatively new properties: the formation of magnetic flux concentrations. We review here the theoretical foundations of this mechanism in terms of what is now called the negative effective magnetic pressure instability. We also present direct numerical simulations of forced turbulence in strongly stratified layers and discuss the qualitative and quantitative similarities with corresponding mean-field simulations. Finally, the relevance to sunspot formation is discussed.

Original languageEnglish
Article number125011
JournalNew Journal of Physics
Volume18
Issue number12
DOIs
StatePublished - 1 Dec 2016

Keywords

  • dynamos
  • stratified turbulence
  • sunspots

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