  Opher et al. 2006 showed that an interstellar magnetic field parallel to the
plane defined by the deflection of interstellar hydrogen atoms can produce a
north/south asymmetry in the distortion of the solar wind termination shock.
This distortion is consistent with Voyager 1 and Voyager 2 observations of the
direction of field-aligned streaming of the termination shock particles
upstream the shock. The model also indicates that such a distortion will result
in a significant north/south asymmetry in the distance to the shock and the
thickness of heliosheath. The two Voyager spacecraft should reveal the nature
and degree of the asymmetry in the termination shock and heliosheath.
