通过间歇磁相互作用的小细丝的形成和瞬时变形
Formation and Immediate Deformation of a Small Filament Through Intermittent Magnetic Interactions
摘要：
一般认为，磁丝的形成是一个磁能积累的过程。然而，在本文中，我们讨论的想法，细丝不会爆发，只会变形时，储存的磁能逐渐释放。结合太阳动力学天文台和其他仪器的高质量观测，我们在2020年4月28日至30日在活动区（AR）12760中呈现了小暗条（F1）的形成和立即变形。在细丝形成之前，三个连续的偶极子迅速出现在AR 12760的中心，并进行分离运动。由于磁偶极与已存在的正极性之间的磁相互作用，日冕增亮因此出现在上覆大气中。随后，由于在F1和另一个邻近灯丝（F2）的相邻端周围发生的磁通量的连续抵消，在F1和F2之间间歇地发生磁感应。最后，F1在剪切中变小，F2变短。结果表明，F1的形成与出现的偶极子序列和先存磁极性之间的间歇性相互作用密切相关，而F1的瞬时形变与F1和F2之间的间歇性相互作用密切相关。我们还认为，由连续的磁活动（磁通出现，取消和收敛）驱动的间歇性磁相互作用在细丝的形成和变形中起着重要的作用。
英文摘要：
It is generally believed that filament formation involves a process of the accumulation of magnetic energy. However, in this paper we discuss the idea that filaments will not erupt and will only deform when the stored magnetic energy is released gradually. Combining high-quality observations from Solar Dynamics Observatory and other instruments, we present the formation and immediate deformation of a small filament (F1) in the active region (AR) 12760 on 28-30 April 2020. Before the filament formation, three successive dipoles quickly emerged with separation motions in the center of AR 12760. Due to the magnetic interaction between magnetic dipoles and pre-existing positive polarities, coronal brightenings consequently appeared in the overlying atmosphere. Subsequently, because of the continuous cancellation of magnetic flux that happened around the adjacent ends of F1 and another nearby filament (F2), the magnetic reconections occurred intermittently occurred between F1 and F2. Finally, F1 lessened in the shear, and F2 became shorter. All the results show that the formation of F1 was closely associated with intermittent interactions between the sequence of emerging dipoles and pre-existing magnetic polarities, and the immediate deformation of F1 was intimately related to intermittent interactions between F1 and F2. We also suggest that the intermittent magnetic interactions driven by the continuous magnetic activities (magnetic-flux emergence, cancellation, and convergence) play an important role in the formation and deformation of filaments.
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