A Spectrophotometric Study of the Light of the Night Sky
Abstract
A spectrophotometric comparison of the night sky and M ~ i shows that the night sky is relatively much stronger than the nebula in ultraviolet light and suggests that for nebular photography improved contrast may be obtained by the use of a filter to remove ultraviolet light. An extensive series of intensity measurements of night-sky radiations shows that no marked varia- tions may be expected within a single night, in the absence of polar auroras, but that on occasional nights the sky is extraordinarily bright, thus greatly reducing the efficiency of direct photography. If periods of unusual activity are excepted, X 5577 and the red pair of lines at X 6300 and X 6364 seem to vary lila com- plementary fashion throughout a given night, but over longer intervals all radiations tend to vary similarly and together
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1941
- DOI:
- 10.1086/144332
- Bibcode:
- 1941ApJ....94..271B