منابع مشابه
The Diffuse Ultraviolet Background Radiation
I review the nature of the diffuse cosmic ultraviolet background radiation. The ultraviolet background is the last frontier: all the other diffuse backgrounds have been examined, at least at some level. The ultraviolet background has only begun to be explored; it offers rich promise of new astrophysical knowledge.
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Observation of faint diffuse ultraviolet background radiation is a delicate undertaking, given the brightness of the ultraviolet stars against which discrimination is essential. I demonstrate that the technique of tomography is unsuited to this particular task.
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The solar UV exposure to the eyes of humans is due to the direct and diffuse components of solar radiation. The direct ocular UV exposures to the eyes are reduced due to the natural aversion of the majority of people from looking directly at the sun. The diffuse UV is incident from all directions and as a result, it is more difficult to minimise the ocular exposure to this component of the sola...
متن کاملUltraviolet Background Radiation from Cosmic Structure Formation
We calculate the contribution to the ultraviolet background (UVB) from thermal emission from gas shock heated by cosmic structure formation. Our main calculation is based on an updated version of Press-Schechter theory. It is consistent with a more empirical estimate based on the observed properties of galaxies and the observed cosmic star formation history. Thermal UVB emission is characterize...
متن کاملUltraviolet Background Radiation from Beyond Pluto
The famous NASA mission New Horizons has now passed well beyond its historic mapping and scientific investigation of the planet Pluto, and is headed farther out into the Kuiper belt— beyond which, New Horizons will venture into the reaches of interstellar space! On its way there, New Horizons will carry out, on 2019 January 1, an investigation of Kuiper belt object (486958) 2014 MU69. Once that...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1999
ISSN: 0252-9211
DOI: 10.1017/s0252921100054567