论文标题
使用扭转Alfén波的血浆离子化诊断
Diagnostics of plasma ionisation using torsional Alfén waves
论文作者
论文摘要
利用最近观察到的太阳突出中的扭转抗体波，我们通过考虑到alfvén波在部分电离的突出等离子体中繁殖的血浆来确定等离子体的电离状态。我们得出了波的进化方程，并将分析溶液与观察结果进行比较，以确定中性的数量密度。使用单个流体等离子体近似，其中波浪阻尼是由整流罩电阻率提供的，我们研究了波的时间演化。通过将方程解与观察数据（周期，幅度，传播速度）进行比较，我们确定了使我们得出部分离子化等离子体中中性量的结论的价值，这是无法直接或间接测量的数量。我们的结果表明，阻尼的扭转alfvén波是血浆电离状态的理想诊断工具。使用一个简单的模型，我们发现在扭转Alfvén波的观测温度下，中性数的数量为$ 5 \ times 10^{10} $ cm $ $^{ - 3} $。
Using the recently observed torsional Alfvén waves in solar prominences, we determine the ionisation state of the plasma by taking into account that Alfvén waves propagate in a partially ionised prominence plasma. We derive the evolutionary equation of waves and compare the analytical solutions to observations to determine the number density of neutrals. Using a single fluid plasma approximation, where the wave damping is provided by the Cowling resistivity, we study the temporal evolution of waves. By comparing the solution of equations with observational data (period, amplitude, propagation speed), we determined the value of the Cowling resistivity that led us to draw a conclusion on the amount of neutrals in the partially ionised plasma, a quantity that cannot be measured directly or indirectly. Our results show that damped torsional Alfvén waves are an ideal diagnostic tool for the ionisation state of the plasma. Using a simple model, we find that at the observational temperature of torsional Alfvén waves, the number of neutrals is of the order of $5\times 10^{10}$ cm$^{-3}$.
