A Model of Homologous Confined and Ejective Eruptions Involving Kink Instability and Flux Cancellation
A Model of Homologous Confined and Ejective Eruptions Involving Kink Instability and Flux Cancellation
复制标题
DOI：
10.3847/2041-8213/ac64a9
复制
发表时间：
2022-04
期刊：
影响因子：
--
通讯作者：
Alshaimaa Hassanin;B. Kliem;N. Seehafer;T. Török
中科院分区：
文献类型：
--
作者：
Alshaimaa Hassanin;B. Kliem;N. Seehafer;T. Török
在本研究中，我们采用一个扭结不稳定通量绳的受限喷发的松弛结束状态作为喷射喷发的初始条件，模拟了一个受限喷发和完全喷发序列。完全的喷发是日冕物质抛射的一种模式，是在光球边界施加的会聚运动的结果，它推动了通量的抵消。在这个过程中，部分正、负外磁通向极性反转线汇聚，重新连接，相互抵消。与抵消磁通相同数量的磁通转移到磁通绳上，增加了日冕场的自由磁能。随着持续的磁通抵消和相关的上覆磁通磁张力的逐渐减弱，我们发现磁通减少≈11%会引起磁通绳的环面不稳定，从而导致全面喷发。这些结果表明，在受限喷发之后，同源的完整喷发可以由通量抵消驱动。
In this study, we model a sequence of a confined and a full eruption, employing the relaxed end state of the confined eruption of a kink-unstable flux rope as the initial condition for the ejective one. The full eruption, a model of a coronal mass ejection, develops as a result of converging motions imposed at the photospheric boundary, which drive flux cancellation. In this process, parts of the positive and negative external flux converge toward the polarity inversion line, reconnect, and cancel each other. Flux of the same amount as the canceled flux transfers to a flux rope, increasing the free magnetic energy of the coronal field. With sustained flux cancellation and the associated progressive weakening of the magnetic tension of the overlying flux, we find that a flux reduction of ≈11% initiates the torus instability of the flux rope, which leads to a full eruption. These results demonstrate that a homologous full eruption, following a confined one, can be driven by flux cancellation.