标题： 第23/24太阳活动极小期有何独特之处？ 显示英文标题

标题： What's So Peculiar About the Cycle 23/24 Solar Minimum?

摘要： 传统上，太阳物理学家会在太阳活动极小期感到焦虑，因为他们期待着新周期的高纬度黑子群。 现在，我们正处于一个延长的黑子极小期，其条件在近期记忆中从未见过，而人们对黑子循环的兴趣再次增加。 在本文中，我将描述当前太阳极小期的一些特征，包括其深度极大、持续时间延长、极区磁场较弱以及开放磁通量较少。 磁通输运模拟表明，这些特征是太阳大尺度经向环流时间变化的结果。 显示英文摘要

摘要： Traditionally, solar physicists become anxious around solar minimum, as they await the high-latitude sunspot groups of the new cycle. Now, we are in an extended sunspot minimum with conditions not seen in recent memory, and interest in the sunspot cycle has increased again. In this paper, I will describe some of the characteristics of the current solar minimum, including its great depth, its extended duration, its weak polar magnetic fields, and its small amount of open flux. Flux-transport simulations suggest that these characteristics are a consequence of temporal variations of the Sun's large-scale meridional circulation.