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The phenomenon of subpulse drifting may hold the key to understanding thepulsar emission mechanism. Here, we report on new observations of PSRJ0034-0721 (B0031-07), carried out with the Murchison Widefield Array at 185MHz. We observe three distinct drift modes whose "vertical" drift bandseparations ($P_3$) and relative abundances are consistent with previousstudies at similar and higher frequencies. The driftbands, however, areobserved to change their slopes over the course of individual drift modes,which can be interpreted as a continuously changing drift rate. The impliedacceleration of the intrinsic carousel rotation cannot easily be explained byplasma models based on ExB drift. Furthermore, we find that methods ofclassifying the drift modes by means of $P_3$ measurements can sometimesproduce erroneous identifications in the presence of a changing drift rate. The"horizontal" separation between driftbands ($P_2$) is found to be larger atlater rotation phases within the pulse window, which is inconsistent with theestablished effects of retardation, aberration, and the motion of the visiblepoint. Longer observations spanning at least ~10,000 pulses are required todetermine how the carousel rotation parameters change from one drift sequenceto the next.

Low Frequency Observations of the Subpulse Drifter PSR J0034-0721 with the Murchison Widefield Array