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We present the first large sample of scintillation arcs in millisecondpulsars, analysing 12 sources observed with the Large European Array forPulsars (LEAP), and the Effelsberg 100\,m telescope. We estimate the delaysfrom multipath propagation, measuring significant correlated changes inscattering timescales over a 10-year timespan. Many sources show compactconcentrations of power in the secondary spectrum, which in PSRs J0613$-$0200and J1600$-$3053 can be tracked between observations, and are consistent withcompact scattering at fixed angular positions. Other sources such as PSRsJ1643$-$1224 and J0621+1002 show diffuse, asymmetric arcs which are likelyrelated to phase-gradients across the scattering screen. PSR B1937+21 shows atleast three distinct screens which dominate at different times and evidence ofvarying screen axes or multi-screen interactions. We model annual and orbitalarc curvature variations in PSR J0613$-$0200, providing a measurement of thelongitude of ascending node, resolving the sense of the orbital inclination,where our best fit model is of a screen with variable axis of anisotropy overtime, corresponding to changes in the scattering of the source. Unmodeledvariations of the screen's axis of anisotropy are likely to be a limitingfactor in determining orbital parameters with scintillation, requiring carefulconsideration of variable screen properties, or independent VLBI measurements.Long-term scintillation studies such as this serve as a complementary tool topulsar timing, to measure a source of correlated noise for pulsar timingarrays, solve pulsar orbits, and to understand the astrophysical origin ofscattering screens.

Variable Scintillation Arcs of Millisecond Pulsars observed with the Large European Array for Pulsars