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An Active Sun Throughout the Maunder Minimum
Measurements of 10Be concentration in the Dye 3 ice core show that magnetic cycles persisted throughout the Maunder Minimum, although the Sun's overall activity was drastically reduced and sunspotsExpand
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Convective and absolute instabilities of fluid flows in finite geometry
Abstract Dynamics of linear and nonlinear waves in driven dissipative systems in finite domains are considered. In many cases (for example, due to rotation) the waves travel preferentially in oneExpand
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Dynamo properties of the turbulent velocity field of a saturated dynamo
In order better to understand how dynamo systems saturate, we study the kinematic dynamo properties of velocity fields that arise from nonlinearly saturated dynamos. The technique is implemented byExpand
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Sensitivity of stratified turbulence to the buoyancy Reynolds number
In this article we present direct numerical simulations of stratified flow at resolutions of up to $204{8}^{2} \times 513$ , to explore scalings for the dynamics of stably stratified turbulence.Expand
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β-Plane Magnetohydrodynamic Turbulence in the Solar Tachocline
This Letter discusses the role of a weak toroidal magnetic field in modifying the turbulent transport properties of stably stratified rotating turbulence in the tachocline. A local two-dimensionalExpand
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On the instability of magnetohydrodynamic shear flows
We consider the linear stability of an ideal, plane–parallel magnetohydrodynamic shear flow with velocity u = (U(z),0, 0) and magnetic field B = (B(z), 0,0). We show how Howard's semicircle theoremExpand
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Transport and Storage of Magnetic Field by Overshooting Turbulent Compressible Convection
We present the results of a series of numerical experiments that investigate the transport of magnetic —elds by turbulent penetrative compressible convection. We —nd that magnetic —ux isExpand
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Direct statistical simulation of out-of-equilibrium jets.
We present direct statistical simulation of jet formation on a β plane, solving for the statistics of a fluid flow via an expansion in cumulants. Here we compare an expansion truncated at secondExpand
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Modulation and symmetry changes in stellar dynamos
Stellar dynamos are governed by non-linear partial differential equations (PDEs) which admit solutions with dipole, quadrupole or mixed symmetry (i.e. with different parities). These PDEs possessExpand
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For how long will the current grand maximum of solar activity persist
[1] Understanding the Sun’s magnetic activity is important because of its impact on the Earth’s environment. The sunspot record since 1610 shows irregular 11-year cycles of activity; they areExpand
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