论文标题
一种磁力图匹配方法,用于向磁通绳向启动启动
A Magnetogram-matching Method for Energizing Magnetic Flux Ropes Toward Eruption
论文作者
论文摘要
我们提出了一种新的``螺旋泵式''方法,用于使冠状平衡能量,该方法含有磁通绳(MFR)朝向喷发。我们以一系列磁性螺旋性的小线脉冲脉冲的一系列磁流失动力学松弛来实现,每种脉冲都通过适当重新恢复现场的电流部分进行模拟。整个过程是``磁化图匹配'',因为它在光谱边界处没有对场的正常组件的变化。通过将其应用于观察到的无力的配置来说明该方法,该构型的MFR使用我们的正则化生物 - 萨瓦特定律方法对其进行了建模。我们发现,尽管外场的双极特征,但MFR喷发仍由两个重新连接过程维持。我们称之为突破性重新连接的第一个类似于四极管配置中的突破重新连接。它发生在当前层中的准分离器上,该层围绕着爆发的MFR,是由光谱线性效应引起的。第二个过程是经典的耀斑重新连接,它在爆发的MFR下方形成的垂直电流层内的第二个准分离器中发展。这两个重新连接过程都与不稳定的MFR的磁力相关联,以通过上覆的环境场推动它,并且它们的相互作用也可能与太阳能耀斑等离子体中发生的热过程有关。考虑的例子表明,我们的方法将对观察到的喷发事件的建模和理想化磁性构型中喷发的理论研究有益。
We propose a new ``helicity-pumping'' method for energizing coronal equilibria that contain a magnetic flux rope (MFR) toward an eruption. We achieve this in a sequence of magnetohydrodynamics relaxations of small line-tied pulses of magnetic helicity, each of which is simulated by a suitable rescaling of the current-carrying part of the field. The whole procedure is ``magnetogram-matching'' because it involves no changes to the normal component of the field at the photospheric boundary. The method is illustrated by applying it to an observed force-free configuration whose MFR is modeled with our regularized Biot--Savart law method. We find that, in spite of the bipolar character of the external field, the MFR eruption is sustained by two reconnection processes. The first, which we refer to as breakthrough reconnection, is analogous to breakout reconnection in quadrupolar configurations. It occurs at a quasi-separator inside a current layer that wraps around the erupting MFR and is caused by the photospheric line-tying effect. The second process is the classical flare reconnection, which develops at the second quasi-separator inside a vertical current layer that is formed below the erupting MFR. Both reconnection processes work in tandem with the magnetic forces of the unstable MFR to propel it through the overlying ambient field, and their interplay may also be relevant for the thermal processes occurring in the plasma of solar flares. The considered example suggests that our method will be beneficial for both the modeling of observed eruptive events and theoretical studies of eruptions in idealized magnetic configurations.