标题： 由于局部和全局自发扰动引起的缓慢和香肠环模式激发 显示英文标题

标题： Slow and sausage loop mode excitation due to local and global spontaneous perturbations

摘要： 我们分析了不同类型扰动的能力——这些扰动与太阳日冕的常规环境能量波动相关——以激发太阳耀斑环中的慢模和穗状模。 我们对理想 MHD 方程进行了数值模拟，考虑了直的磁化等离子体管，这些管子受到局部和全局的能量沉积的影响。 我们发现，典型小耀斑（[$\sim$($10^{27}$-$10^{30}$) erg]）的局部环能量沉积倾向于驱动慢激波，从而诱导慢模模式。 对于每个测试的局部能量沉积，都获得了慢模特征。 同时，为了获得可观察到的穗状模模式，需要一个全局扰动，能够瞬时改变环内部温度，即，传导加热的时间尺度必须远小于辐射冷却时间尺度。 通过改变参数$\beta$进行的实验表明，穗状模的激发并不显著依赖于该参数的值，而是依赖于能量源的局部或全局特性。 显示英文摘要

摘要： 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 $\beta$ 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.