Pioneer 10 observations of zodiacal light brightness near the ecliptic: Changes with heliocentric distance

Optical Investigation of Dust in the Solar System

“…Weinberg and Sparrow 1978). No appreciable zodiacal light was observed beyond 3.5 AU (Hanner et al 1976). …”

“…From first Pioneer data Hanner et al (1976) found for a one parameter model v=l. From Helios 1 and 2 ) Leinert (1978) obtains v= 1.3 ±0.1 (0.09 <r<l AU) .…”

7. Meteor Streams in the Making

“…THE ZODIACAL CLOUD Whipple (1967) suggests that comets are probably also a major, if not the sole, source of dust that keeps the self-destructive zodiacal cloud in a steady-state condition, and that Periodic Comet Encke might have been the most significant contributor to the cloud in the past. The cometary origin of the zodiacal particles appears to be reinforced by the measurements on board of Pioneers 10 and 11 (Zook and Soberman 1974, Hanner and Weinberg 1974, Humes et al 1975, Hanner et al 1976. While the results from the three experiments are discordant (Soberman et al 1976), Dohnanyi (1976) finds that the contribution of asteroidal particles to the dust in the asteroidal belt is in any event small compared with the cometary contribution.…”

Measuring Light from the Epoch of Reionization with CIBER, the Cosmic Infrared Background Experiment

“…Given the current state of the measurements shown in Figure 1, it might not ever be possible to remove emission from the ZL to a level sufficient to measure the REBL with direct photometry from near the Earth. However, the density of the Zodiacal dust falls sharply with helio-centric distance; a naive extrapolation of the Pioneer Zodiacal dust counts (Hanner et al, 1976) suggests that, at r > 5 AU, the brightness of the ZL should be a factor of ∼ 1000 smaller than near Earth. Clearly, deploying an instrument package to the outer solar system would offer significant advantages for measurement of the (R)EBL (Cooray et al, 2009).…”