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Published online by Cambridge University Press: 14 August 2015
The zodiacal light experiments on Helios 1 and Helios 2 have been continually operating since launch in December 1974 and January 1976, respectively. The data support the view that the distribution of interplanetary dust is rather simple in space and quite constant in time. Instrument and data reduction have been described by Leinert et al. (1978). In the following we present Helios 2 data only.