Areas exhibiting enhanced nocturnal radiance, often stemming from natural phenomena or human activities, present unique observational and environmental characteristics. Such locations may display increased atmospheric luminescence due to auroral activity, bioluminescence, or the scattering of artificial light. For instance, regions near major urban centers typically experience heightened sky brightness compared to remote, undeveloped areas.
The study and preservation of these zones are significant for several reasons. They influence astronomical research by affecting the visibility of celestial objects. Understanding the sources and characteristics of the enhanced nocturnal radiance is crucial for mitigating light pollution and its impacts on ecosystems and human health. Historically, awareness of these areas has grown alongside increasing urbanization and its associated artificial illumination.