NASA Goddard Space Flight Center, Laboratory for Extraterrestrial Physics, Greenbelt, Maryland 20771

A 1.3-year oscillation in the IMP-8 and Voyage 2 solar wind plasma radial speed observations for the period of 1987-1994 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.

Geophys. Res. Lett., 22, No. 14, 1845-1848, July 1995