导电流体中的磁场反转与长期记忆
Magnetic field reversals and long-time memory in conducting flows.
作者信息
Dmitruk P, Mininni P D, Pouquet A, Servidio S, Matthaeus W H
机构信息
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Buenos Aires, Argentina.
Department of Atmospheric and Space Physics, University of Colorado and National Center for Atmospheric Research, Boulder, Colorado, USA.
出版信息
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Oct;90(4):043010. doi: 10.1103/PhysRevE.90.043010. Epub 2014 Oct 16.
Employing a simple ideal magnetohydrodynamic model in spherical geometry, we show that the presence of either rotation or finite magnetic helicity is sufficient to induce dynamical reversals of the magnetic dipole moment. The statistical character of the model is similar to that of terrestrial magnetic field reversals, with the similarity being stronger when rotation is present. The connection between long-time correlations, 1/f noise, and statistics of reversals is supported, consistent with earlier suggestions.
利用球几何中的一个简单理想磁流体动力学模型，我们表明，旋转或有限磁螺旋度的存在足以引发磁偶极矩的动力学反转。该模型的统计特性与地球磁场反转的统计特性相似，当存在旋转时，这种相似性更强。长期相关性、1/f噪声与反转统计之间的联系得到了支持，这与早期的推测一致。
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