We examined the interplanetary magnetic field behavior in the field enhancement regions associated with the high velocity stream fronts observed during the primary mission of Helios 2 (January--April 1976). The principal conclusions of our investigation are the following: (1) The relative variation of the field magnitude ranges between 1.3 and 1.8 and is independent of heliocentric distance at least between 0.5 and 1 AU; (2) Close to the sector boundaries the field enhancements are consistent with a field perturbation occurring in a plane perpendicular to both the solar equator and the radial direction; (3) The field line has occasionally the form of a cylindrical helix rather than a simple planar geometry; (4) There is no compelling evidence to relate, in the inner solar system and in the period of interest, the field enhancements with the shape and location of the sector boundary surface.