论文标题
由于本地和全局自发扰动引起的缓慢和香肠环路模式激发
Slow and sausage loop mode excitation due to local and global spontaneous perturbations
论文作者
论文摘要
我们分析了不同类型的扰动的能力 - 与太阳能电晕的通常环境能量波动相关，以激发太阳能耀斑环的缓慢和香肠模式。我们对局部和全球能量沉积的直血等离子磁管进行了MHD理想方程的数值模拟。我们发现，典型的微量流量[$ \ sim $（$ 10^{27} $ - $ 10^{30} $）ERG的本地环路沉积很容易驱动诱导慢速模式模式的慢速冲击波。对于环路内的每个测试的局部能量沉积，都可以获得缓慢的模式。同时，要获得可观察到的香肠模式模式，需要瞬间修改内部环温度的全局扰动，即特性导电加热时间必须比辐射冷却速度小得多。通过不同的参数$β$进行的实验表明，香肠模式的激发并不显着取决于该参数的值，而是取决于能源的全局或局部特征。
We analyse the capability of different type of perturbations -associated with usual environment energy fluctuations of the solar corona- to excite slow and sausage modes in solar flaring loops. We perform numerical simulations of the MHD ideal equations considering straight plasma magnetic tubes subject to local and global energy depositions. We find that local loop energy depositions of typical microflares [$\sim$($10^{27}$-$10^{30}$) erg] are prone to drive slow shock waves that induce slow mode patterns. The slow mode features are obtained for every tested local energy deposition inside the loop. Meanwhile, to obtain an observable sausage mode pattern a global perturbation, capable to modify instantaneously the internal loop temperature, is required, i.e. the characteristic conductive heating time must be much smaller than the radiative cooling one. Experiments carried out by varying parameter $β$ show us that the excitation of sausage modes does not depend significantly on the value of this parameter but on the global or local character of the energy source.
