The Discovery of Nulling and Mode Switching Pulsars with CHIME/Pulsar

First discovery of new pulsars and RRATs with CHIME/FRB

We report the discovery of seven new Galactic pulsars with the Canadian Hydrogen Intensity Mapping Experiment's Fast Radio Burst backend (CHIME/FRB). These sources were first identified via single pulses in CHIME/FRB, then followed up with CHIME/Pulsar. Four sources appear to be rotating radio transients (RRATs), pulsar-like sources with occasional single pulse emission with an underlying periodicity. Of those four sources, three have detected periods ranging from 220 ms to 2.726 s. Three sources have more persistent but still intermittent emission and are likely intermittent or nulling pulsar…

A new model for nulling and moding in radio pulsars

Single pulse behaviour of radio pulsars is usually interpreted in terms of the ExB drift of a radio beam. It is shown that antisymmetric arrangement of the radio-bright zones can produce several types of observed single pulse phenomena: the half-cycle jump in subpulse modulation phase, left-right-middle subpulse sequence and switching between the core-dominated and cone-dominated pulsation modes. The geometry can also produce nulling, both sporadic and intermodal. The model implies that the radio-quiet intervals that separate the main pulse and interpulse in PSR B0826-34 correspond to azimutha…

利用FAST研究四颗消隐脉冲星

Study of Four nulling pulsars with FAST

本文利用FAST对四颗消隐脉冲星进行研究，揭示了模式变换、准周期状态切换及消隐与亚脉冲漂移共存等多样现象，展示了FAST探测细微辐射状态的能力。

A model for nulling and mode changing in pulsars

We propose that in some pulsars the magnetosphere has different states with different geometries or/and different distributions of currents, it occasionally switches between them. These states have different spindown rates and emission beams, in some of the states no radioemission is produced at all. Switching into a different state manifests as a mode change when we see different parts of the emission beam or the beams in different states have significantly different geometries, it manifests as nulling when we either miss the new beam or no radioemission is generated in the new state. We show…

脉冲星B1237+25在111MHz的观测：平均轮廓、模式切换、零点、微结构

Pulsar B1237+25 at 111~MHz: average profile, mode switching, nullings, microstructure

研究脉冲星B1237+25在111MHz的观测，发现其平均轮廓中存在新成分，揭示了不同辐射模式下的结构变化及微结构特征。

Independent discovery of a nulling pulsar with unusual sub-pulse drifting properties with the Murchison Widefield Array

We report the independent discovery of PSR J0027-1956 with the Murchison Widefield Array (MWA) in the ongoing Southern-sky MWA Rapid Two-meter (SMART) pulsar survey. J0027-1956 has a period of ~1.306 s, a dispersion measure (DM) of ~20.869 pc cm^-3 , and a nulling fraction of ~77%. This pulsar highlights the advantages of the survey's long dwell times (~80 min), which, when fully searched, will be sensitive to the expected population of similarly bright, intermittent pulsars with long nulls. A single-pulse analysis in the MWA's 140-170 MHz band also reveals a complex sub-pulse drifting behavio…