Planned space-based ultra-high-energy cosmic-ray detectors (TUS, JEM-EUSO andS-EUSO) are best suited for searches of global anisotropies in the distributionof arrival directions of cosmic-ray particles because they will be able toobserve the full sky with a single instrument. We calculate quantitatively thestrength of anisotropies associated with two models of the origin of thehighest-energy particles: the extragalactic model (sources follow thedistribution of galaxies in the Universe) and the superheavy dark-matter model(sources follow the distribution of dark matter in the Galactic halo). Based onthe expected exposure of the experiments, we estimate the optimal strategy forefficient search of these effects.
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