论文标题
平均场α效应对太阳周期的记忆有任何影响吗？
Does the mean-field alpha effect have any impact on the memory of the solar cycle?
论文作者
论文摘要
如果Babcock-Leighton机制是poloidal场的唯一来源，那么从以对流为主和扩散为主导的运动发电机模型获得的太阳周期24的预测是不同的。 Yeates等。 （2008年）认为，由于太阳能发电机的对流和扩散为主导的太阳对流区域的太阳能发电机的不同记忆而产生的差异。我们的目的是研究从以对流为主和扩散为主导的运动学太阳发电机模型获得的太阳周期内存的差异。具体来说，我们探讨了帕克的平均场$α$效应（除了Babcock-Leighton机制外）是否对太阳周期的记忆产生了任何影响。我们使用了运动通量传输太阳能发电机模型，由于Babcock-Leighton机制和平均场$α$效应，因此发生了多型场的产生。我们还考虑了该模型中的随机波动，并探索了最小值最小的极性场和环形场的极性场之间的循环间相关性。太阳能发电机记忆在扩散为主的发电机方程中只限于一个周期，而在以对流为主的态度中，存储器在几个太阳周期上分布。但是，在平均场$α$效应中没有波动时，添加平均场α效应将太阳能发电机的记忆降低到一个循环中的一个周期内。当在平均场poloidal源中引入波动时，明显的情况更为复杂，但在几个周期中出现了非常弱但显着的相关性。我们的结果表明，将平均场alpha效应纳入磁通运输Babcock-Leighton Dynamo模型的框架中会导致其他复杂性，这些复杂性可能会影响太阳能周期的预测发电机模型的记忆力和可预测性。
Predictions of solar cycle 24 obtained from advection-dominated and diffusion-dominated kinematic dynamo models are different if the Babcock-Leighton mechanism is the only source of the poloidal field. Yeates et al. (2008) argue that the discrepancy arises due to different memories of the solar dynamo for advection- and diffusion-dominated solar convection zones. We aim to investigate the differences in solar cycle memory obtained from advection-dominated and diffusion-dominated kinematic solar dynamo models. Specifically, we explore whether the inclusion of Parker's mean-field $α$ effect, in addition to the Babcock-Leighton mechanism, has any impact on the memory of the solar cycle. We used a kinematic flux transport solar dynamo model where poloidal field generation takes place due to both the Babcock-Leighton mechanism and the mean-field $α$ effect. We additionally considered stochastic fluctuations in this model and explored cycle-to-cycle correlations between the polar field at the minima and toroidal field at cycle maxima. Solar dynamo memory is always limited to only one cycle in diffusion-dominated dynamo regimes while in advection-dominated regimes the memory is distributed over a few solar cycles. However, the addition of a mean-field alpha effect reduces the memory of the solar dynamo to within one cycle in the advection-dominated dynamo regime when there are no fluctuations in the mean-field $α$ effect. When fluctuations are introduced in the mean-field poloidal source a more complex scenario is evident, with very weak but significant correlations emerging across a few cycles. Our results imply that inclusion of a mean-field alpha effect in the framework of a flux transport Babcock-Leighton dynamo model leads to additional complexities that may impact memory and predictability of predictive dynamo models of the solar cycle.
