Analysis of Imp 1 (Explorer 43) interplanetary plasma and magnetic field fluctuations on a scale of 1 hour for the period March 18 to April 7, 1971, reveals that linearly and circularly polarized Alfv¿n waves were rarely present. Fluctuations having most of the characteristics of large amplitude (ΔBx/B¿?0.4) 'Alfv¿n waves' were observed ?40% of the time and moved away from the sun nearly along B. These were not pure transverse Alfv¿n waves, however, because they were accompanied by nonzero fluctuations in the magnetic field intensity (ΔB/B¿?0.06). No simple relation between 'Alfv¿n waves' and streams was found.