Connecting the interstellar magnetic field at the heliosphere to the
  Loop I superbubble
  The local interstellar magnetic field affects both the heliosphere and the
surrounding cluster of interstellar clouds (CLIC). Measurements of linearly
polarized starlight provide the only test of the magnetic field threading the
CLIC. Polarization measurements of the CLIC magnetic field show multiple local
magnetic structures, one of which is aligned with the magnetic field traced by
the center of the "ribbon" of energetic neutral atoms discovered by the
Interstellar Boundary Explorer (IBEX). Comparisons between the bulk motion of
the CLIC through the local standard of rest, the magnetic field direction, the
geometric center of Loop I, and the polarized dust bridge extending from the
heliosphere toward the North Polar Spur direction all suggest that the CLIC is
part of the rim region of the Loop I superbubble.
