论文标题
精细结构对由香肠模式调制的耀斑环的陀螺仪发射的影响
Influence of fine structures on gyrosynchrotron emission of flare loops modulated by sausage modes
论文作者
论文摘要
香肠模式是解释太阳耀斑的短期准周期搏动（QPP）的一种主要机制。向前建模无线电发射对于观察和了解其与QPP的联系至关重要。使用来自三维磁水动力学（MHD）模拟的数值输出，我们将模型模拟的陀螺仪（GS）发射由香肠模式调节，并检查环形结构的影响。分析了越过环路中心的倾斜视线，分析了发射强度的时间演变。我们发现，在具有或不使用精细结构的模型的香肠模式时期，低频和高频强度振荡。对于出现光学厚度机制的低频排放，在某种程度上，细小的结构在某些视角下大大降低了强度的调节幅度。相反，对于具有光学薄机制保持的高频排放，精细结构或视角的效果是边缘的。我们的结果表明，香肠模式的周期性强度变化并未被精细的结构擦除，即使耀斑结构化，香肠模式仍然是QPPS的有希望的候选机制。
Sausage modes are one leading mechanism for interpreting short period quasi-periodic pulsations (QPPs) of solar flares. Forward modeling their radio emission is crucial for identifying sausage modes observationally and for understanding their connections with QPPs. Using the numerical output from three-dimensional magnetohydrodynamic (MHD) simulations, we forward model the gyrosynchrotron (GS) emission of flare loops modulated by sausage modes and examine the influence of loop fine structures. The temporal evolution of the emission intensity is analyzed for an oblique line of sight crossing the loop center. We find that the low- and high-frequency intensities oscillate in-phase at the period of sausage modes for models with or without fine structures. For low-frequency emissions where the optically thick regime arises, the modulation magnitude of the intensity is dramatically reduced by the fine structures at some viewing angles. On the contrary, for high-frequency emissions where the optically thin regime holds, the effect of fine structures or viewing angle is marginal. Our results show that the periodic intensity variations of sausage modes are not wiped out by the fine structures, and sausage modes remains a promising candidate mechanism for QPPs even when flare loops are fine-structured.
