The effect of a meridional flow on Parker's interface dynamo

K. Petrovay, A. Kerekes

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Parker's interface dynamo is generalized to the case when a homogeneous flow is present in the high-diffusivity (upper) layer in the lateral direction (i.e. perpendicular to the shear flow in the lower layer). This is probably a realistic first representation of the situation near the bottom of the solar convective zone, as the strongly subadiabatic stratification of the tachocline (lower layer in the interface dynamo) imposes a strong upper limit on the speed of any meridional flow there. Analytic solutions to the eigenvalue problem are presented for the cases of vanishing diffusivity contrast and infinite diffusivity contrast. Unlike the trivial case of a homogeneous system, the ability of the meridional flow to reverse the propagation of the dynamo wave is strongly reduced in the interface dynamo. In particular, in the limit of high diffusivity contrast relevant to the solar case it is found that a meridional flow of realistic amplitude cannot reverse the direction of propagation of the dynamo wave. The implications of this result for the solar dynamo problem are discussed.

Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume351
Issue number3
DOIs
Publication statusPublished - Jul 1 2004

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meridional flow
diffusivity
propagation
shear flow
eigenvalue
stratification
eigenvalues
effect

Keywords

  • MHD
  • Sun: interior
  • Sun: magnetic fields

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

The effect of a meridional flow on Parker's interface dynamo. / Petrovay, K.; Kerekes, A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 351, No. 3, 01.07.2004.

Research output: Contribution to journalArticle

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