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Commission 21: Light of the Night Sky

Published online by Cambridge University Press:  01 December 2005

Bo Å. S. Gustafson ,
Adolf N. Witt ,
E. Dwek ,
P. Lamy ,
R. Henry  and
I. Mann
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Commission 21, one of IAU's smallest commissions, consists of some hundred members and consultants working to understand and describe the light of the night sky with emphasis on the diffuse components. Many more work on these topics without being members of the commission. Light is here defined in its broader sense of electromagnetic radiation of any frequency. The diffuse components of the light of the night sky encompass a variety of physical phenomena over the full range of cosmic distance scales and include scattered light, thermal emission, line emission, and any other emission phenomena producing a diffuse light source. These attract interest not only as scientific topics of study in their own right but also as an unwanted foreground or background against which all other sky phenomena are observed. Commission 21 has for mandate to promote research and availability of results on issues related to the diffuse light of the night sky. This document is a report on activities in this field and is not confined to the activities of its members, no distinction is made between work carried out by commission members and non commission members. The report is organized starting with a summary of the state of broad surveys that provide most of the observations. The report on developments in the various disciplines start with the sources closest to the observer known as airglow and progresses by way of the interplanetary and interstellar mediums to the increasingly distant integrated starlight, diffuse galactic light and diffuse emission in other galaxies ending with the extragalactic background radiation.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Transactions T26A: Reports on Astronomy , December 2005 , pp. 161 - 166
Copyright
Copyright © International Astronomical Union 2007

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