A new type of double-diffusive helical magnetorotational instability in rotational flows with positive shear

A new type of double-diffusive helical magnetorotational instability in rotational flows with positive shear

Mamatsashvili, G.; Stefani, F.; Hollerbach, R.; Rüdiger, G.

Abstract

We revealed a novel type of linear axisymmetric helical magnetorotational instability in viscous and resistive rotating flows with radially increasing angular velocity, or positive shear, exposed to a helical magnetic field. It operates for a broad range of positive shear, provided that magnetic Prandtl number is not unity. This instability can play an important role in the magnetic activity of the equatorial parts of the solar tachocline, where the shear of differential rotation is positive.

Keywords: magnetorotational instability; liquid metals; MHD; solar tachocline

  • Open Access Logo Lecture (Conference)
    11th Pamir International Conference on Fundamental and Applied MHD, 01.07.2019, Reims, France
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    8-th International Symposium on Bifurcations and Instabilities in Fluid Dynamics, 16.07.2019, Limerick, Ireland
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    21st International Couette Taylor Workshop, 05.-09.07.2021, Twente, The Netherlands
  • Open Access Logo Lecture (Conference) (Online presentation)
    The Fourth Russian Conference on Magnetohydrodynamics, 20.-22.09.2021, Perm, Russia

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Permalink: https://www.hzdr.de/publications/Publ-30329