The Galactic magnetic field, locally observed to be on the order of a few$\mu$G, is sufficiently strong to induce deflections in the arrival directionsof ultra-high energy cosmic rays. We present a method that establishes measuresof self-consistency for hypothesis sets comprised of cosmic magnetic fieldmodels and ultra-high energy cosmic ray composition and source distributions.The method uses two independent procedures to compare the backtracked velocityvectors outside the magnetic field model to the distribution of backtrackedvelocity directions of many isotropic observations with the same primaryenergies. This allows for an estimate of the statistical consistency betweenthe observed data and simulated isotropic observations. Inconsistency with theisotropic expectation of source correlation in both procedures is interpretedas the hypothesis set providing a self-consistent description of GMF and UHECRproperties for the cosmic ray observations.
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