Observations on the potential fluctuations detected by a small external probe when two energetic plasma jets stream through each other have been described previously. This was attributed to an ion-electron interstreaming instability. Here it is shown that the experimental values for the growth rate and the frequency range of the instability can be explained more accurately by the same theory if the local ion energy distribution is assumed to be different for ions of different energies.
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Little et al. (1970) studied this question.
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