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We establish that for PSR B0031-07 the orthogonal polarization modes switchat a single pulse level synchronously with the periodic drifting subpulses seenin total intensity. There are only four other pulsars known for which thisphenomenon is observed. PSR B0031-07 is unique as it is the only source in thisgroup which has multiple stable drift modes. For both drift modes visible atour observing frequency centered at 1369 MHz, the modulation of polarizationmodes is synchronous with the drifting subpulses. In one of the drift modes, adiscontinuity in the modulation pattern of polarization properties occurshalfway through the pulse, coinciding with a slight change in the slope of theintensity drift band. In contrast to what has been suggested for this pulsar inthe past, this, plus other differences in the polarization of the modulatedemission observed for the two drift modes, suggests that a drift mode change ismore than a change in the underlying carousel radius and that magnetosphericpropagation effects play an important role. The ellipticity evolvesasymmetrically in time during the modulation cycle, which in the framework of acarousel model implies that the polarized sub-beams are asymmetric with respectto the sense of circulation, something which is not observed for other pulsars.Birefringence in the magnetosphere, resulting in the orthogonal polarizationmodes to spatially separate, is not enough to explain these results. It isargued that more complex magnetospheric processes, which possibly allowconversion between orthogonal polarization modes, play a role.

The drifting subpulses of PSR B0031-07 and its synchronously modulated radio polarization