arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1408.6473astro-ph.SR
收藏

导致快速太阳日冕物质抛射的爆发性、细丝状磁通量绳的直接证据

Direct Evidence of an Eruptive, Filament-Hosting Magnetic Flux Rope Leading to a Fast Solar Coronal Mass Ejection

Bin Chen, Timothy S. Bastian, Dale E. Gary

摘要:

磁通量绳(MFR)被认为是太阳日冕物质抛射(CME)的核心。一个著名的例子是低日冕中的日珥空洞,有时在爆发时组成一个由三部分组成的白光(WL)CME。这样的系统通常在太阳平静的地区观测到,长期以来一直被认为是MFR的表现,相对较冷的细丝材料聚集在底部附近。然而,对于那些起源于活动区的喷发性、不稳定性的MFR系统,观测证据一直难以捉摸。通过利用SDO/AIA的多通带极紫外线(EUV)观测,我们提出了在低日冕中爆发MFR的直接证据,该低日冕具有热包络和较冷的核心;后者可能是经历部分爆发的灯丝的上部,这是后来在上日冕中观察到的快速WL CME的盘绕内核。这种类似MFR的结构存在于喷发前一个多小时,并显示出连续的动力学演化阶段,其中可能涉及理想和非理想的物理过程。MFR运动学的时间被发现是很好的相关性与相关的长时间C1.9耀斑的能量释放。我们认为,长持续时间的耀斑是延长的能量释放的结果与垂直电流片引起的爆发MFR。

英文摘要:

Magnetic flux ropes (MFRs) are believed to be at the heart of solar coronal mass ejections (CMEs). A well-known example is the prominence cavity in the low corona that sometimes makes up a three-part white-light (WL) CME upon its eruption. Such a system, which is usually observed in quiet-Sun regions, has long been suggested to be the manifestation of an MFR with relatively cool filament material collecting near its bottom. However, observational evidence of eruptive, filament-hosting MFR systems has been elusive for those originating in active regions. By utilizing multi-passband extreme-ultra-violet (EUV) observations from SDO/AIA, we present direct evidence of an eruptive MFR in the low corona that exhibits a hot envelope and a cooler core; the latter is likely the upper part of a filament that undergoes a partial eruption, which is later observed in the upper corona as the coiled kernel of a fast, WL CME. This MFR-like structure exists more than one hour prior to its eruption, and displays successive stages of dynamical evolution, in which both ideal and non-ideal physical processes may be involved. The timing of the MFR kinematics is found to be well correlated with the energy release of the associated long-duration C1.9 flare. We suggest that the long-duration flare is the result of prolonged energy release associated with the vertical current sheet induced by the erupting MFR.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑