地磁反转规律性的边缘,Physical Review Research

当前位置： X-MOL 学术 › Phys. Rev. Research › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

地磁反转规律性的边缘
Physical Review Research ( IF 3.5 ) Pub Date : 2021-02-18 , DOI: 10.1103/physrevresearch.3.013158
Breno Raphaldini , Everton S. Medeiros , David Ciro , Daniel Ribeiro Franco , Ricardo I. F. Trindade

地磁场逆转仍然是地球物理学中最引人关注的问题之一，被认为是由发电机机制引起的混沌过程。在本文中，我们使用从海床收集的最后170迈尔的极性标度数据，为连续极性间隔序列的复杂度与相应反转率之间的反比关系提供了有力的证据。特别是，当发现最大逆转率时，在侏罗纪中期，极性间隔序列的变异性达到最小值，在白垩纪早白垩世之前的早白垩世，最后20 Myrs出现两次。这些事实增加了在地磁场反转中出现高规律性的可能性。为了阐明这一过程，我们在地磁逆转的最小模型中研究了从规则状态到混沌状态的过渡。我们表明，即使在混乱的政权中，该系统在过渡附近也保留了常规行为的特征。我们建议地磁逆转在不同程度的不规则性之间切换，主要周期性为

\approx 70

kyrs是由于沉浸在相空间混沌区域中的“重影”极限环（GLC）或不稳定周期轨道（UPO）引起的。

"点击查看英文标题和摘要"

Geomagnetic reversals at the edge of regularity

Geomagnetic field reversals remain as one of the most intriguing problems in geophysics and are regarded as chaotic processes resulting from a dynamo mechanism. In this article we use the polarity scale data of the last 170 Myrs collected from the ocean floor to provide robust evidence for an inverse relationship between the complexity of sequences of consecutive polarity intervals and the respective reversal rate. In particular, the variability of sequences of polarity intervals reaches minimum values in the mid-Jurassic when a maximum reversal rate is found, in the early Cretaceous preceding the Cretaceous Superchron, and twice in the last 20 Myrs. These facts raise the possibility of epochs of high regularity in the geomagnetic field reversals. To shed light on this process, we investigate the transition from regular to chaotic regime in a minimal model for geomagnetic reversals. We show that even in chaotic regimes, the system retains the signature of regular behavior near to transitions. We suggest that geomagnetic reversals have switched between different degrees of irregularity, with a dominant periodicity of