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Detailed Reference Information
Goldstein et al. 1986
Goldstein, M.L., Roberts, D.A. and Matthaeus, W.H. (1986). Systematic errors in determining the propagating direction of interplanetary Alfvenic fluctuations. Journal of Geophysical Research 91: doi: 10.1029/JA080i012p13357. issn: 0148-0227.

Analyses of Alfvenic fluctuations in the solar wind contain a systematic effect in which outward propagation is favored. The effect is generally small at and beyond 1 AU in a Mach 10 flow but can become important where the Mach number is lower, e.g. inside 1 AU. If the propagation speeds of the inward and outward propagating Alfvenic fluctuations are properly included, this systematic effect can be removed. A technique for doing this is illustrated using both artificial and spacecraft data. The results suggest that time intervals originally thought to be outward propagating sometimes contain wave number bands in the cross helicity spectrum of inward propagating Alfvenic fluctuations.

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Journal of Geophysical Research
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