论文标题
通过太阳的双极磁区域的纬度变化发电机饱和度
Dynamo saturation through the latitudinal variation of bipolar magnetic regions in the Sun
论文作者
论文摘要
太阳磁周期的观察表明，循环的幅度在过去并非一直在增长。因此，必须有一种机制来停止太阳中磁场的生长。我们在Babcock-Leighton Dynamo框架下展示了最近提出的机制，据信这是目前太阳能磁场生成的最有希望的范式。该机制基于以下事实，即更强的太阳能循环在较高的纬度上产生双极磁区域（BMR），因此比较弱的纬度更高的平均纬度。我们在三维的Babcock-Leighton太阳能发电机模型中捕获了这种效果，并表明当环形磁场试图生长时，它会在较高的纬度下产生BMR。较高纬度处的BMR会产生一个较小的多态场，因此限制了我们模型中磁场的总体生长。因此，我们的研究表明，BMR的纬度变化是限制太阳磁场生长的潜在机制。
Observations of the solar magnetic cycle showed that the amplitude of the cycle did not grow all the time in the past. Thus, there must be a mechanism to halt the growth of the magnetic field in the Sun. We demonstrate a recently proposed mechanism for this under the Babcock--Leighton dynamo framework, which is believed to be the most promising paradigm for the generation of the solar magnetic field at present. This mechanism is based on the observational fact that the stronger solar cycles produce bipolar magnetic regions (BMRs) at higher latitudes and thus have higher mean latitudes than the weaker ones. We capture this effect in our three-dimensional Babcock--Leighton solar dynamo model and show that when the toroidal magnetic field tries to grow, it produces BMRs at higher latitudes. The BMRs at higher latitudes generate a less poloidal field, which consequently limits the overall growth of the magnetic field in our model. Thus, our study suggests that the latitudinal variation of BMRs is a potential mechanism for limiting the magnetic field growth in the Sun.
