Unveiling the emission properties of three long-period pulsars using FAST

Pulsar radio emission phenomena are highly diverse, with individual pulsars often exhibiting unique behaviors. Most pulsars typically display one or two common emission phenomena, such as nulling or mode changing, and it is relatively rare for a single pulsar to exhibit multiple phenomena. This is especially true for long-period pulsars, which are less frequently studied and tend to show more complex and varied emission behaviors. In this paper, we investigate the emission properties of three long-period pulsars (PSR J1945+1211, PSR J2323+1214, and PSR J1900−0134) observed with the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) during the CRAFTS survey at a center frequency of 1.25 GHz. Key findings include the detection of quasi-periodic nulls and the first identification of dwarf pulses in PSR J2323+1214, characterized by weaker and narrower emissions compared to regular bursts. Additionally, a detailed microstructure analysis of PSR J1900−0134 revealed pulse patterns as short as 1.57 microseconds. Bright pulses were observed in all three pulsars at different rates. These observations suggest complex magnetospheric processes, possibly linked to magnetic reconnections, providing a better understanding into the emission mechanisms and behaviors of long-period pulsars.