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| Author |
Rayleigh, L. |
| Title |
Colour of the Night Sky |
Type |
Journal Article |
| Year |
1920 |
Publication |
Nature |
Abbreviated Journal |
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| Volume |
106 |
Issue |
2653 |
Pages |
8 |
| Keywords |
Natural sky brightness; airglow |
| Abstract |
So far as I have been able to learn, little or nothing is known about the colour of the night sky. The light is too faint for ordinary visual discrimination of colour, which disappears with diminishing intensity of illumintion much Before the light it self ceases to be perceptible. |
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GFZ @ kyba @ |
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3121 |
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| Author |
Kolláth, Z.; Száz, D.; Tong, K.P.; Kolláth, K. |
| Title |
The Colour of the Night Sky |
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Journal Article |
| Year |
2020 |
Publication |
Journal of Imaging |
Abbreviated Journal |
J. Imaging |
| Volume |
6 |
Issue |
9 |
Pages |
90 |
| Keywords |
Skyglow; Natural light; Instrumentation |
| Abstract |
The measurement of night sky quality has become an important task in night sky conservation. Modern measurement techniques involve mainly a calibrated digital camera or a spectroradiometer. However, panchromatic devices are still prevalent to this day, even in the absence of determining the spectral information of the night sky. In the case of multispectral measurements, colour information is currently presented in multiple ways. One of the most frequently used metrics is correlated colour temperature (CCT), which is not without its limitation for the purpose of describing especially the colour of natural night sky. Moreover, visually displaying the colour of the night sky in a quantitatively meaningful way has not attracted sufficient attention in the community of astronomy and light pollution research—most photographs of the night sky are post-processed in a way for aesthetic attractiveness rather than accurate representation of the night sky. The spectrum of the natural night sky varies in a wide range depending on solar activity and atmospheric properties. The most noticeable variation in the visible range is the variation of the atomic emission lines, primarily the green oxygen and orange sodium emission. Based on the accepted models of night sky emission, we created a random spectral database which represents the possible range of night sky radiance distribution. We used this spectral database as a learning set, to create a colour transformation between different colour spaces. The spectral sensitivity of some digital cameras is also used to determine an optimal transformation matrix from camera defined coordinates to real colours. The theoretical predictions were extended with actual spectral measurements in order to test the models and check the local constituents of night sky radiance. Here, we present an extended modelling of night sky colour and recommendations of its consistent measurement, as well as methods of visualising the colour of night sky in a consistent way, namely using the false colour enhancement. |
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2313-433X |
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3120 |
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| Author |
Shang, H. |
| Title |
Study on the Influence of Port Coastal Light Pollution on Visual Navigation |
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Journal Article |
| Year |
2020 |
Publication |
Journal of Coastal Research |
Abbreviated Journal |
Journal of Coastal Research |
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115 |
Issue |
sp1 |
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250 |
| Keywords |
Safety; Vision |
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Navigation aids are navigation aids for the safety of ships. They are divided into three categories: visual navigation aids, audio navigation aids and radio navigation aids. It provides reliable navigation safety guarantee for water transportation, fishery, marine development and national defense construction, and provides reliable navigation safety guarantee for the establishment of safe economic passage at sea and inside sea, which is an important part of the maritime Silk Road. Visual navigation aids are the most basic navigation aids, sound navigation aids only play a warning role, radio navigation aids have developed into a modern all-weather navigation aids system, especially the popularization of satellite navigation technology, put forward higher requirements for visual navigation aids. |
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0749-0208 |
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GFZ @ kyba @ |
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3119 |
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Derrien, M.M.; Stokowski, P.A. |
| Title |
Discursive constructions of night sky experiences: Imagination and imaginaries in national park visitor narratives |
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Journal Article |
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2020 |
Publication |
Annals of Tourism Research |
Abbreviated Journal |
Annals of Tourism Research |
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85 |
Issue |
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Pages |
103038 |
| Keywords |
Astrotourism; Society |
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Communities and protected areas worldwide have initiated programs to protect and promote dark night skies. Yet, limited research has explored how and why night skies become of interest or meaningful to people. Because night skies are literally beyond human reach, we focus on how visitors to a U.S. national park imagine night skies and invoke imaginaries that make night skies meaningful. Drawing from interviews, we examine how visitors use symbolic language, narrative, and other discursive practices to develop the social, cultural, and spatial contexts of their night sky experiences. Findings inform our understanding of imagination and imaginaries in tourism and recreation research, while offering new approaches to night skies research. |
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0160-7383 |
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GFZ @ kyba @ |
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3118 |
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Kogure, M.; Yue, J.; Nakamura, T.; Hoffmann, L.; Vadas, S.L.; Tomikawa, Y.; Ejiri, M.K.; Janches, D. |
| Title |
First Direct Observational Evidence for Secondary Gravity Waves Generated by Mountain Waves Over the Andes |
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Journal Article |
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2020 |
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Geophysical Research Letters |
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Geophys. Res. Lett. |
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47 |
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17 |
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Remote Sensing; Atmospheric Science |
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A mountain wave with a significant brightness temperature amplitude and ~500 km horizontal wavelength was observed over the Andes on 24–25 July 2017 in Atmospheric Infrared Sounder (AIRS)/Aqua satellite data. In the Modern‐Era Retrospective Analysis for Research and Applications, version 2 (MERRA‐2), reanalysis data, the intense eastward wind flowed over the Andes. Visible/Infrared Imaging Radiometer Suite (VIIRS)/Suomi‐NPP (National Polar‐orbiting Partnership) did not detect the mountain waves; however, it observed concentric ring‐like waves in the nightglow emissions at ~87 km with ~100 km wavelengths on the same night over and leeward of the Southern Andes. A ray tracing analysis showed that the mountain waves propagated to the east of the Andes, where concentric ring‐like waves appeared above a region of mountain wave breaking. Therefore, the concentric ring‐like waves were likely secondary waves generated by momentum deposition that accompanied mountain wave breaking. These results provide the first direct evidence for secondary gravity waves generated by momentum deposition. |
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0094-8276 |
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GFZ @ kyba @ |
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3117 |
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