Due to stochastic nature of interstellar magnetic fields, cosmic rays, trajectory of which are bent by those, are practically observed from all directions, so

Due to stochastic nature of interstellar magnetic fields, cosmic rays, trajectory of which are bent by those, are practically observed from all directions, so even if solar system distorts its own magnetic field this will have almost no effect on vosmic rays flux. Magnetic field is not a shield, for the charged particles it is rather a lens which converges or diverges their trajectories.