1.1.11 The Ultraviolet Scattering Efficiency of Interplanetary Dust Grains

Content Provider	Scilit
Author	Lillie, Charles F.
Copyright Year	1976
Description	Surface brightness photometry of the night sky with experiments aboard several rockets and spacecraft indicates a significant enhancement of the brightness of the zodiacal light relative to the sun in the 1700 to 3000 A spectral region. This enhancement is most likely due to Mie scattering by non-absorbing (dielectric) particles with a mean radius of ~0.05µ and a real index of refraction which increases rapidly from ~1.4 to ~2.0 at ~2000 A, where most optical materials have an absorption edge (and exhibit a similar phenomenon). Assuming the visible zodiacal light is produced by 10 to 30µ particles, the number density of 0.5µ particles must be ~3 × $10^{5}$ times greater, in good agreement with size distributions from crater counts and space probe particle detectors. Ultraviolet observations of comets indicate the enhancement is not due to a bulk property of unmodified cometary dust grains. The most probable source of submicron particles is the breakup of large agglomerates of small (~1000 A) spherical particles like those found by particle collection experiments.
Related Links	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/0493A93347D0270077BC8A5C04A893C6/S025292110005140Xa.pdf/div-class-title-1-1-11-the-ultraviolet-scattering-efficiency-of-interplanetary-dust-grains-div.pdf
Ending Page	63
Page Count	1
Starting Page	63
ISSN	02529211
DOI	10.1017/s025292110005140x
Journal	International Astronomical Union Colloquium
Volume Number	31
Language	English
Publisher	Cambridge University Press (CUP)
Publisher Date	1976-01-01
Access Restriction	Open
Subject Keyword	International Astronomical Union Colloquium Astronomy and Astrophysics Dust Grains Zodiacal Light
Content Type	Text
Resource Type	Article