Progress in the Global Modeling of the Galactic Magnetic Field
  We discuss the global modeling of the properties of the Galactic Magnetic
Field (GMF). Several improvements and variations of the model of the GMF from
Jansson & Farrar (2012) (JF12) are investigated in an analysis constrained by
all-sky rotation measures of extragalactic sources and polarized and
unpolarized synchrotron emission data from WMAP and Planck. We present the
impact of the investigated model variations on the propagation of
ultrahigh-energy cosmic rays in the Galaxy.
