  We report on radio and X-ray observations of PSR 1832+0029, a 533-ms radio
pulsar discovered in the Parkes Multibeam Pulsar Survey. From radio
observations taken with the Parkes, Lovell and Arecibo telescopes, we show that
this pulsar exhibits two spindown states akin to PSRs B1931+24 reported by
Kramer et al. and J1841-0500 reported by Camilo et al. Unlike PSR B1931+24,
which switches between "on" and "off" states on a 30--40 day time-scale, PSR
1832+0029 is similar to PSR J1841-0500 in that it spends a much longer period
of time in the off-state. So far, we have fully sampled two off-states. The
first one lasted between 560 and 640 days and the second one lasted between 810
and 835 days. From our radio timing observations, the ratio of on/off spindown
rates is $1.77 \pm 0.03$. Chandra observations carried out during both the on-
and off-states of this pulsar failed to detect any emission. Our results
challenge but do not rule out models involving accretion onto the neutron star
from a low-mass stellar companion. In spite of the small number of intermittent
pulsars currently known, difficulties in discovering them and in quantifying
their behavior imply that their total population could be substantial.
