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Observations of changes in size of the ionospheric polar capallow the dayside and nightside reconnection rates to be quantified. Fromthese it is straightforward to estimate the rate of antisunward transport ofmagnetic flux across the polar regions, quantified by the cross polar cappotential ΦPC. When correlated with upstream measurements of thenorth-south component of the IMF, ΦPC is found to increase formore negative Bz, as expected. However, we also find that ΦPC does not, on average, decrease to zero, even for strongly northward IMF. Inthe past this has been interpreted as evidence for a viscous interactionbetween the magnetosheath flow and the outer boundaries of themagnetosphere. In contrast, we show that this is the consequence of flowsexcited by tail reconnection, which is inherently uncorrelated with IMFBz

Dayside and nightside contributions to the cross polar cap potential: placing an upper limit on a viscous-like interaction