闪电放电等离子体地域性特征分析

依据闪电回击过程的光谱,结合等离子体理论,计算得到放电通道的温度、电子密度和组分粒子数密度等参数,并对4个地区闪电放电等离子体的特性参数及其光谱特征进行了对比分析.结果表明,沿海地区放电通道的温度一般高于高原地区;通道中一次电离离子占主要地位,且NⅡ离子数密度最高;不同地区的闪电放电通道中,NⅡ、OⅡ离子的数密度占同种元素总粒子数密度的百分比变化不大,高原地区回击通道内NⅠ、OⅠ粒子所占浓度百分比略高于沿海地区;对于温度相同或相近的回击通道,沿海地区通道内的电子密度、粒子数密度、平均压强通常高于西部高原地区.

Analysis of the regional characteristic of lightning discharge plasma

According to cloud-to-ground lightning spectra,and by theoretical calculations of plasma,the characteristic parameters of discharge plasma such as the electron temperature,electron density,particle densities of main components for individual stroke have been obtained.The regional characters for lightning discharge channels in different areas have also been investigated.The result shows that the temperature parameters of lightning discharge channels of coast area are higher than those in plateau.Lightning channels are almost completely ionized,and the first ionized particles occupy the main station while NII has the highest particle density.On the other hand,the relative concentrations of NII and OII in lightning channels are near a constant while the relative concentrations of NI and OI in lightning discharge channels of coast area are lower than those in plateau.The electron densities,particle densities and the pressures of lightning discharge channels with the same or approximate temperature are also larger in coast area than those in west plateau.