A 1.3-year oscillation in the IMP-8 and Voyager 2 solar wind plasma radial speed observations for the period of 1987--94 was recently reported [Richardson et al., 1994>. The same periodicity is identified for the same time period in the North--South component of the interplanetary magnetic field at 1 AU when studied with a dynamic power spectrum. This observation sheds new light on the nature of these unusual oscillations. ¿ American Geophysical Union 1995