Analysis of IMP I (Explorer 43) plasma and magnetic field fluctuations on a scale of our hour for the period March 18, 1971 to April 7, 1971 reveals that linearly and circularly polarized Alfv6n waves are rarely present in the solar wind at 1 AU.The most prevalent microscale fluctuations appear to be large-amplitude, (8Bx/,M 0.4) "Alfvn waves" with small but non-zero fluctuations in the'magnetic field intensity, B (8 B/F 0.06).These waves are present ; 40% of the time and are predominantly propagating away from the sun along B.
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Burlaga et al. (1976) studied this question.
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