It is shown that within the framework of nearly incompressible magnetohydrodynamics, but not within that of neutral‐fluid hydrodynamics, a k −5/3 inertial‐range wave number density fluctuation spectrum is to be expected at the same times that k −5/3 kinetic energy and magnetic energy cascade spectra are present. A previous discrepancy between theory and observation in the local interstellar medium and solar wind is thereby resolved.
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Montgomery et al. (1987) studied this question.
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