Upstream waves have been postulated to be a major source of energy for the dayside magnetic pulsations within the magnetosphere. Thus it is of interest to determine over what frequency range in the ion foreshock the power of fluctuations in the solar wind is enhanced. We have examined the magnetic field data from pairs of spacecraft when they are on either side of the ion foreshock boundary. We find that the power of magnetic fluctuations is enhanced only at periods less than about two minutes, not at longer periods. Thus the upstream waves may contribute to Pc 3 and Pc 4 pulsations in the dayside magnetosphere, but they can not be directly responsible for the longer period waves.
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Le et al. (1990) studied this question.
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