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A Comparison of Solar Wind Parameters from Experiments on the IMP 8 and Wind Spacecraft

This paper compares solar wind speeds and densities derived from the MIT and LANL experiments on the IMP 8 spacecraft and from the MIT experiments on IMP 8 and the Wind spacecraft. The solar wind speeds determined by all three instruments agree within a few percent. In contrast, we find that the densities from the LANL IMP 8 experiment show a velocity dependence not seen in the comparison of densities from the two MIT experiments. The densities measured by the MIT IMP 8 experiment appear to be ∼7% higher than the densities determined from the Wind solar wind experiment. The reason for that discrepancy is still under investigation.