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The young pulsar PSR B1828-11 has long been known to show correlated shapeand spin-down changes with timescales of roughly 500 and 250 days, perhapsassociated with large-scale magnetospheric switching. Here we presentmulti-hour observations with the Parkes and Green Bank Telescopes at multiplephases across the roughly 500-day cycle and show that the pulsar undergoesmode-changing between two stable, extreme profile states. The fraction of timespent in each profile state naturally accounts for the observed overall "shapeparameter" (defined to be 0 for wide profiles and 1 for narrow ones); this andthe variable rate of the mode transitions are directly related to the spin-downchanges. We observe that the mode transition rate could plausibly function asan additional parameter governing the chaotic behaviour in this object whichwas proposed earlier by Seymour and Lorimer. Free precession is not needed toaccount for the variations.

Mode switching and oscillations in PSR B1828-11