Title: Short-period pulsar oscillations following a glitch Show Chinese title

Title: 短周期脉冲星振荡在跃迁之后

Abstract: Following a glitch, the crust and magnetized plasma in the outer core of a neutron star are believed to rapidly establish a state of co-rotation within a few seconds by process analogous to classical Ekman pumping. However, in ideal magnetohydrodynamics, a final state of co-rotation is inconsistent with conservation of energy of the system. We demonstrate that, after the Ekman-like spin up is completed, magneto-inertial waves continue to propagate throughout the star, exciting torsional oscillations in the crust and plasma. The crust oscillation is irregular and quasi-periodic, with a dominant frequency of the order of seconds. Crust oscillations commence after an Alfv\'en crossing time, approximately half a minute at the magnetic pole, and are subsequently damped by the electron viscosity over approximately an hour. Because of their short periods, it is unlikely that the oscillations correspond to any observed phenomena in radio timing data. Show Chinese abstract

Abstract: 在出现故障后，中子星外核的外壳和磁化等离子体被认为会在几秒钟内通过类似于经典Ekman泵送的过程迅速建立共旋转状态。 然而，在理想磁流体动力学中，最终的共旋转状态与系统的能量守恒不一致。 我们证明，在类似Ekman的加速过程完成后，磁惯性波继续在整个恒星中传播，激发外壳和等离子体的扭转振荡。 外壳振荡是不规则且准周期性的，主要频率约为几秒。 外壳振荡在阿尔芬穿越时间之后开始，大约在磁极处为半分钟，并随后在约一小时内由电子粘度衰减。 由于它们的周期较短，这些振荡不太可能对应于射电计时数据中的任何观测现象。