标题： 脉冲星中圆偏振光的起源 显示英文标题

标题： On the origin of the circular polarization in radio pulsars

摘要： 研究了脉冲星磁层等离子体中的圆极化波的性质。 结果显示，脉冲星射电辐射中观测到的一些圆偏振的观测特征可以在基于异常多普勒共振模型的框架内定性地得到解释。 所进行的分析表明，如果电子和正电子的洛伦兹因子之差相对较高，则其中一种圆极化波会成为超光速波，因此不能通过回旋不稳定性生成。 我们建议这种情况对应于在整个观测频率下的平均脉冲轮廓中某一旋向的圆偏振占主导的脉冲星。 对于洛伦兹因子之差的中间值，两种圆极化波都会被生成，但对于高频，同旋向的波生成得更有效；而对于低频，另一旋向的波生成则占主导地位。 这应该对应于圆偏振度对频率有强依赖性的脉冲星。 洛伦兹因子之差相对较小时的情况对应于平均脉冲轮廓中心处圆偏振符号反转的脉冲星。 显示英文摘要

摘要： Properties of circularly polarized waves are studied in the pulsar magnetosphere plasma. It is shown that some observational characteristics of the circular polarization observed in the pulsar radio emission can be qualitatively explained in the framework of the model based on anomalous Doppler resonance. Performed analysis provides that if the difference between Lorentz factors of electrons and positrons is relatively high, one of the circularly polarized waves becomes super-luminal and therefore can not be generated by cyclotron instability. We suggest that this case corresponds to the pulsars with the domination of one hand of circular polarization through the whole averaged pulse profile at all observed frequencies. For intermediate values of the difference between Lorentz factors both circularly polarized waves are generated, but the waves of one handness are much more effectively generated for high frequencies, whereas generation of another handness dominates for low frequencies. This should correspond to the pulsars with strong frequency dependence of the degree of circular polarization. The case of relatively small difference between Lorentz factors corresponds to the pulsars with sign reversal of the circular polarization in the centre of averaged pulse profiles.