传导流中的磁场反转和长时间记忆
Magnetic field reversals and long-time memory in conducting flows
摘要：
采用一个简单的理想磁流体动力学模型在球形几何形状，我们表明，无论是旋转或有限的磁螺旋度的存在下，足以引起动态反转的磁偶极矩。该模型的统计特征与地球磁场反转的统计特征相似，当存在旋转时，这种相似性更强.支持长时间相关、$1/f$噪声和反转统计之间的联系，与早期的建议一致.
英文摘要：
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.
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