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Pulsar B0943+10 is well known for its `B' (burst) mode, characterized byaccurately drifting subpulses, in contrast to its chaotic `Q' (quiet) mode. Sixnew Arecibo observations at 327 MHz with durations of 2+ hours each have shedconsiderable light on the modal dynamics of this pulsar. Of these, three werefound to be exclusively `B' mode, and three were discovered to exhibittransitions from the `Q' to the `B' mode. One of these observations haspermitted us to determine the circulation time of the subbeam carousel in the`Q' mode for the first time, at some 36.4$\pm$0.9 stellar rotation periods. Theonset of the `B' mode is then observed to commence similarly in all threeobservations. The initial circulation time is about 36 periods and relaxes tonearly 38 periods in a roughly exponential fashion with a characteristic timeof some 1.2 hours. This is the longest characteristic time ever found in amode-switching pulsar. Moreover, just after the `B'-mode onset the pulsarexhibits a symmetrical resolved-double profile form with a somewhat strongertrailing component, but this second component slowly dies away leaving theusual single `B'-mode profile with the longitude of the magnetic axis fallingat about its trailing half power point. Thus it would appear that Q-to-B- andB-to-Q-transitions have different characteristic times. Some speculations aregiven on the nature of this slow modal alternation.Comment: 9 pages, 10 figure

The topology and polarisation of subbeams associated with the “drifting” subpulse emission of pulsar B0943+10