标题： 脉冲星子脉冲漂移研究的内加速区域火花运动机制 显示英文标题

标题： A Mechanism of Spark Motion in Inner Acceleration Region to Investigate Subpulse Drifting in Pulsars

摘要： 脉冲星中的相干无线电辐射是由于相对论性流动的非稳态等离子体流中的不稳定性激发的，这种等离子体流是由靠近恒星表面的内加速区（IAR）中的放电现象产生的。 许多详细的研究表明，IAR是一个部分屏蔽的间隙（PSG），其由非偶极磁场主导，并且有来自表面的连续离子流出。 子脉冲漂移现象预计是由于PSG中火花的可变$\mathbf{E}\times\mathbf{B}$漂移引起的，其中火花滞后于脉冲星的共转速度。 详细的观测显示，子脉冲漂移行为存在广泛的多样性，其中轮廓不同成分中的子脉冲具有不同的相位轨迹。 但漂移周期在所有轮廓成分中被观察到是恒定的，误差范围内。 利用火花在PSG中滞后于共转速度的概念以及表面非偶极磁场的不同取向，我们模拟了代表性脉冲星样本中预期的单脉冲行为。 我们的结果表明，通过这些关于非偶极IAR中火花动力学的简单假设，可以再现不同类型的漂移相位行为。 显示英文摘要

摘要： Coherent radio emission in pulsars is excited due to instabilities in a relativistically streaming non-stationary plasma flow, which is generated from sparking discharges in the inner acceleration region (IAR) near the stellar surface. A number of detailed works have shown the IAR to be a partially screened gap (PSG) dominated by non-dipolar magnetic fields with continuous outflow of ions from the surface. The phenomenon of subpulse drifting is expected to originate due to variable $\mathbf{E}\times\mathbf{B}$ drift of the sparks in PSG, where the sparks lag behind corotation velocity of the pulsar. Detailed observations show a wide variety of subpulse drifting behaviour where subpulses in different components of the profile have different phase trajectories. But the drifting periodicity is seen to be constant, within measurement errors, across all components of the profile. Using the concept of sparks lagging behind corotation speed in PSG as well as the different orientations of the surface non-dipolar magnetic fields we have simulated the expected single pulse behaviour in a representative sample of pulsars. Our results show that the different types of drifting phase behaviour can be reproduced using these simple assumptions of spark dynamics in a non-dipolar IAR.