非中性相对论等离子体在脉冲星磁层中的运动

The kinetic property of non-neutrally relativistic plasma in pulsar magnetosphere

探讨了脉冲星磁层加速区外磁流管中非中性相对论等离子体的运动学特征.在满足净电荷密度处处等于Goldreich-Julian电荷密度的条件下,计算了不同磁倾角和不同磁力线上的次级正负电子速度分布.结果表明,电子速度经历显著的加速或减速.在靠近自转轴一侧的上半磁层和靠近赤道一侧的下半磁层,次级电子加速或减速的图像有显著不同.沿磁力线平行电场的总电压差所引起的电子动能改变与电子初始动能相当,但该电压差远小于磁层加速区的总电压差.该结果对研究磁层中粒子能谱的不均匀性是有意义的.

The kinetic property of non-neutrally relativistic plasma in pulsar flux tubes out of acceleration gap is studied.In the case that net charge density of primary and secondary positrons and electrons is equal to the Goldreich-Julian charge density,the velocity distribution is calculated for different magnetic field lines and inclination angles.It is shown that the velocities of electrons and positrons vary significantly.The variation property in the upper half magnetosphere near rotation axis is essentially different from that in the lower half magnetosphere near equator.The total voltage drop along a field line,which is much smaller than that in acceleration gap,can cause kinetic energy variation of electrons/positrons comparable to their initial kinetic energy.The results are helpful to the study of anisotropic energy spectral distribution of particles in pulsar magnetosphere.