I did a little checking on other uses of your term, and I found this one:

El Comité Español de la Iluminación en su Informe Técnico “Guía para la reducción del Resplandor Luminoso Nocturno” lo define como:
“El brillo producido por la difusión y reflexión de la luz artificial en los gases y partículas en suspensión de la atmósfera, que constituye un inconveniente para la observación astronómica”.
http://www.prodetur.es/wwwroot/sigloxxi/anexos//prodeturener...

This explanation of "sky glow" (part of the Wikipedia article on light pollution) sounds similar to your definition and the one above:

Sky glow refers to the "glow" effect that can be seen over populated areas. It is the combination of light reflected from what it has illuminated and from all of the badly directed light in that area, being refracted in the surrounding atmosphere. This refraction is strongly related to the wavelength of the light. Rayleigh scattering, which makes the sky appear blue in the daytime, also affects light that comes from the earth into the sky and is then redirected to become sky-glow, seen from the ground. As a result, blue light contributes significantly more to sky-glow than an equal amount of yellow light. Sky glow is of particular irritation to astronomers, because it reduces contrast in the night sky to the extent where it may even become impossible to see the brightest stars. Astronomers have begun to use the Bortle Dark-Sky Scale, to quantify sky glow, since it was published in Sky & Telescope magazine.[11] The Bortle Scale rates the darkness of the sky, inhibited by sky glow, on a scale of one to nine, providing a detailed description of each position on the scale.
http://en.wikipedia.org/wiki/Light_pollution#Sky_glow

If you check out other docs. on "resplandor luminoso nocturno" and on "sky glow", I think you'll come to the conclusion (like I did) that they're the same thing.

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Note added at 1 hr (2007-12-06 11:55:33 GMT)
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Here's another ref:

DISPERSIÓN DE LA LUZ HACIA CIELO NOCTURNO
También denominado ***skyglow o resplandor nocturno***. Este fenómeno está producido tanto por la emisión directa como por la desviación de la luz artificial de su dirección original hacia el cielo nocturno. La dispersión de la luz se puede originar de dos maneras diferentes:
http://www.cacoa.es/portal/archivos/IT-contaminacion_luminic...