Abstract
THERE have recently been several attempts1–3 to observe the motion of the interplanetary dust cloud by measuring the Doppler shift of the Hβ Fraunhofer line in the spectrum of the zodiacal light. From the variation of the Doppler shift with elongation it is possible in principle4 to deduce the way in which the particle number density varies with particle radius, or, if this variation is slow, the way in which the number density varies with distance from the Sun.
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JAMES, J., SMEETHE, M. Motion of the Interplanetary Dust Cloud. Nature 227, 588–589 (1970). https://doi.org/10.1038/227588a0
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DOI: https://doi.org/10.1038/227588a0
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