Title: Subpulse Drifting, Nulling and Mode changing in PSR J1822$-$2256 Show Chinese title

Title: 亚脉冲漂移、消零和模式变化在PSR J1822$-$2256中

Abstract: We report a detailed observational study of the single pulses from the pulsar J1822$-$2256. The pulsar shows the presence of subpulse drifting, nulling as well as multiple emission modes. During these observations the pulsar existed primarily in two modes; mode A with prominent drift bands and mode B which was more disorderly without any clear subpulse drifting. A third mode C was also seen for a short duration with a different drifting periodicity compared to mode A. The nulls were present throughout the observations but were more frequent during the disorderly B mode. The nulling also exhibited periodicity with a clear peak in the fluctuation spectra. Before the transition from mode A to nulling the pulsar switched to a third drifting state with periodicity different from both mode A and C. The diversity seen in the single pulse behaviour of the pulsar J1822$-$2256 provides an unique window into the emission physics. Show Chinese abstract

Abstract: 我们报道了对脉冲星 J1822$-$2256 单脉冲的详细观测研究。该脉冲星显示出亚脉冲漂移、熄灭以及多种辐射模式的存在。在这些观测过程中，脉冲星主要处于两种模式：模式 A 具有明显的漂移带，模式 B 则较为无序且没有明显的亚脉冲漂移。此外，在较短的时间内还观察到了第三种模式 C，其漂移周期性与模式 A 不同。在整个观测期间都存在熄灭现象，但在无序的 B 模式下更为频繁。熄灭现象也表现出周期性，并在波动频谱中显示出清晰的峰值。在从模式 A 向熄灭过渡之前，脉冲星切换到了第三种漂移状态，其周期性与模式 A 和 C 都不同。脉冲星 J1822$-$2256 在单脉冲行为中的多样性为我们提供了深入了解辐射物理的独特窗口。