  Analyses of multiple pulse sequences of B2303+30 reveal that this pulsar has
two distinct emission modes. One mode (B) follows a steady even-odd pattern and
is more intense. The second mode (Q) is characteristically weak, but has
intermittent driftbands with a periodicity of approximately 3 P/cycles, and
nulls much more frequently than the B mode. Both modes occur with roughly equal
frequency and their profiles have a similar single-humped form with a slight
asymmetry. Our observations and analyses strongly suggest that the subpulse
driftrates in both modes are linked in a series of cycles, which can be
modelled as relaxing oscillations in the underlying circulation rate.
