论文标题
脉冲星磁层中的无线电发射和电间隙
Radio Emission and Electric Gaps in Pulsar Magnetospheres
论文作者
论文摘要
Pulsar无线电发射的起源是理论天体物理学中的旧难题之一。在这封信中，我们提出了一个全球动力学等离子体模拟，该模拟从第一原理中显示了在脉冲星磁层中如何以及何处产生无线电发射。我们观察到电间隙的自洽形成，这些缝隙会定期点燃电子峰值排放。差距在极盖上方，并在批量返回流中。缝隙的排放激发了电磁模式，这些模式与真实脉冲星的无线电发射具有多种特征。我们还观察到血浆波的激发，并通过在外部磁层中流动不稳定性来充电。我们的数值实验表明，全球动力学模型可以深入了解脉冲星的发射物理学，并可以帮助解释其多波长观测值。
The origin of pulsar radio emission is one of the old puzzles in theoretical astrophysics. In this Letter we present a global kinetic plasma simulation which shows from first-principles how and where radio emission can be produced in pulsar magnetospheres. We observe the self-consistent formation of electric gaps which periodically ignite electron-positron discharge. The gaps form above the polar-cap, and in the bulk return-current. Discharge of the gaps excites electromagnetic modes which share several features with the radio emission of real pulsars. We also observe the excitation of plasma waves and charge bunches by streaming instabilities in the outer magnetosphere. Our numerical experiment demonstrates that global kinetic models can provide deep insight into the emission physics of pulsars, and may help interpret their multi-wavelength observations.
