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PSR J1825$-$0935 (PSR B1822$-$09) switches between radio-quiet (Q-mode) andradio-bright (B-mode) modes. The Q-mode is known to have a periodic fluctuationthat modulates both the interpulse and the main pulse with the same period.Earlier investigators argued that the periodic Q-mode modulation is associatedwith drifting subpulses. We report on single-pulse observations of PSRJ1825$-$0935 that were made using the Parkes 64-m radio telescope with acentral frequency of 1369 MHz. The high-sensitivity observations revealed thatthe periodic Q-mode modulation is in fact a periodic longitude-stationaryintensity modulation occurring in the interpulse and the main pulse. Thefluctuation spectral analysis showed that the modulation period is about $43P_1$, where $P_1$ is the rotation period of the pulsar. Furthermore, we confirmthat the modulation patterns in the interpulse and the main pulse arephase-locked. Specifically, the intensities of the interpulse and theimmediately following main pulse are more highly correlated than for the mainpulse and interpulse at any other lag. Polarization properties of the strongand weak Q-mode states are different, even for the trailing part of the mainpulse which does not show the periodic intensity modulation.

Periodic Q-mode modulation in PSR J1825$-$0935 (PSR B1822$-$09)