Full-sphere simulations of a circulation-dominated solar dynamo: Exploring the parity issue
Full-sphere simulations of a circulation-dominated solar dynamo: Exploring the parity issue
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DOI：
10.1051/0004-6361:20041199
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发表时间：
2004-05
影响因子：
6.5
通讯作者：
P. Chatterjee;D. Nandy;A. Choudhuri
中科院分区：
文献类型：
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作者：
P. Chatterjee;D. Nandy;A. Choudhuri
基于日震确定的太阳自转廓线和太阳表面附近的α效应，我们建立了一个全球面二维运动学太阳发电机模型，该模型反映了Babcock-Leighton的观点，即极向场是由倾斜的双极活动区衰变产生的.假设在速跃层之下稍有渗透的纬向环流起着重要的作用。最近有人提出了一些疑问，这样一个模型的能力，再现类偶极宇称。我们专门解决奇偶校验问题，并表明，偶极模式是首选的，当某些合理的条件得到满足，最重要的条件是要求极向场应有效地扩散，以获得耦合跨越赤道。我们的模型再现了观测数据的各个方面，包括太阳黑子和弱扩散场之间的相位关系。
We explore a two-dimensional kinematic solar dynamo model in a full sphere, based on the helioseismically determined solar rotation profile and with an α effect concentrated near the solar surface, which captures the Babcock-Leighton idea that the poloidal field is created from the decay of tilted bipolar active regions. The meridional circulation, assumed to penetrate slightly below the tachocline, plays an important role. Some doubts have recently been raised regarding the ability of such a model to reproduce olar-like dipolar parity. We specifically address the parity issue and show that the dipolar mode is preferred when certain reasonable conditions are satisfied, the most important condition being the requirement that the poloidal field should diffuse efficiently to get coupled across the equator. Our model is shown to reproduce various aspects of observational data, including the phase relation between sunspots and the weak, diffuse field.