We report on a detailed study of the mode switching in pulsar J1326$-$6700 by analyzing the data acquired from the Parkes 64 m radio telescope at 1369 MHz. During the abnormal mode, the emission at the central and trailing components becomes extremely weak. Meanwhile, the leading emission shifts toward earlier longitude by almost 2°, and remains in this position for typically less than a minute. The mean flux density of the normal mode is almost five times that of the abnormal mode. Our data show that, for PSR J1326$-$6700, 85% of the time was spent in the normal mode and 15% was in the abnormal mode. The intrinsic distributions of mode timescales can be well described by Weibull distributions, which present a certain amount of memory in mode switching. Furthermore, a quasiperiodicity has been identified in the mode switching in pulsar J1326$-$6700. The estimated delay emission heights based on the kinematical effects indicate that the abnormal mode may have originated from higher altitude than the normal mode.

中文翻译：

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Pulsar J1326–6700 中的模式切换

我们通过分析从帕克斯 64 m 射电望远镜以 1369 MHz 获取的数据，详细研究了脉冲星 J1326$-$6700 的模式切换。在异常模式期间，中心和尾部组件的发射变得非常微弱。同时，领先的发射向较早的经度移动了近 2°，并且通常会保持在这个位置不到一分钟。正常模式的平均磁通密度几乎是异常模式的五倍。我们的数据显示，对于 PSR J1326$-$6700，85% 的时间花在正常模式，15% 的时间花在异常模式。模式时间尺度的内在分布可以用威布尔分布很好地描述，它在模式切换中呈现出一定数量的记忆。此外，在脉冲星 J1326$-$6700 的模式切换中已经确定了准周期性。基于运动学效应估计的延迟发射高度表明异常模式可能起源于比正常模式更高的高度。