太阳活动周期与网间磁场的纬度变化
Solar-cycle and Latitude Variations in the Internetwork Magnetism
摘要：
宁静太阳磁场的重要性在于，它总是或多或少地存在，作为能量的恒定提供者，独立于太阳周期阶段。关于平静太阳磁性的公开问题包括与其起源有关的问题。大多数人认为，局部发电机作用是产生这种现象的机制，这一事实意味着，在太阳表面的任何位置和任何时间，平静的太阳磁场几乎是相同的。许多著作声称安静的太阳根本没有任何变化，尽管其中一些对这一说法提出了质疑，并发现了安静太阳磁性周期变化的温和证据。在这项工作中，我们发现了明显的变化，在互联网络的磁性都与纬度和太阳周期。就纬度而言，我们发现平均磁场向太阳两极增加。我们还发现长期的变化，在磁盘中心和太阳两极的平均磁场，这两个变化几乎是相关的。这些发现并不支持本地发电机作用是安静太阳磁场的唯一工厂的想法。
英文摘要：
The importance of the quiet-Sun magnetism is that it is always there to a greater or lesser extent, being a constant provider of energy, independently of the solar cycle phase. The open questions about the quiet-Sun magnetism include those related to its origin. Most people claim that the local dynamo action is the mechanism that causes it. This fact would imply that the quiet-Sun magnetism is nearly the same at any location over the solar surface and at any time. Many works claim that the quiet Sun does not have any variation at all, although a few of them raise doubt on this claim and find mild evidence of a cyclic variation in the the quiet-Sun magnetism. In this work, we detect clear variations in the internetwork magnetism both with latitude and solar cycle. In terms of latitude, we find an increase in the averaged magnetic fields toward the solar poles. We also find long-term variations in the averaged magnetic field at the disk center and solar poles, and both variations are almost anticorrelated. These findings do not support the idea that the local dynamo action is the unique factory of the quiet-Sun magnetism.
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