Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....41..385r&link_type=abstract
Astronomy and Astrophysics, vol. 41, no. 3-4, July 1975, p. 385-389. In French.
Astronomy and Astrophysics
Astrophysics
2
Density Distribution, Ecliptic, Interplanetary Medium, Zodiacal Dust, Cosmic Dust, Iron, Silicon Dioxide, Solar System, Zodiacal Light
Scientific paper
An expression is obtained for the density distribution of interplanetary dust assuming that the decrease in density is exponential in both the transverse and radial directions. It is shown that the modulation of the zodiacal light observed at the ecliptic pole defines one parameter (H) in this expression as a function of the inclination angle between the zodiacal light and the ecliptic plane, and that the experimental value of the ratio between transverse and radial radiances defines another parameter (R). It is then deduced that the flatness of the zodiacal cloud (expressed by R/H) is less than 5 and that the cloud's plane of symmetry is very close to that of the solar system's invariant plane. Assuming that the interplanetary dust consists primarily of iron and silicon dioxide grains, it is found that only dust grains with a size distribution in the submicron range give a radiance ratio close to the observed value.
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