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Aboushelib, M.F.; Abozaid, A.A.; Nawar, S.; Hendy, Y.H.M.; Morcos, A.B. |
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Title |
Preliminary site selection for an observatory in the Egyptian Eastern Desert |
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Journal Article |
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Year |
2019 |
Publication |
Astrophysics and Space Science |
Abbreviated Journal |
Astrophys Space Sci |
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Volume  |
364 |
Issue |
10 |
Pages |
163 |
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Keywords |
Skyglow; Astronomy; Observatory; Egypt; Africa; Sky Quality Meter |
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Abstract |
This work aims for choosing preliminary sites that can be candidates for a new astronomical observatory that will replace the Kottamia observatory. The candidate sites have been selected to be investigated after proposing a few criteria. Concerning light pollution and elevation of the sites as the main factors, we chose the candidate sites depending on the zenith sky brightness and the elevation. The night sky brightness has been measured using a Sky Quality Meter at different altitude degrees and the values of the zenith sky brightness were compared to those of different observatory sites. Our night sky brightness observations were found to be in agreement with the satellite’s data and comparable to those of dark sites, with average values of 22.07, 22.03, 21.57 and 21.58 magSQM/arcsec2. We also have obtained the Aerosol Optical Depth (AOD) and extinction coefficient due to the aerosol for the candidate sites using satellite data (Terra/MODIS). |
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National Research Institute of Astronomy and Geophysics, Helwan, Cairo, Egypt; m.f.aboushelib(at)nriag.sci.eg |
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Springer |
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English |
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English |
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0004-640X |
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Call Number |
GFZ @ kyba @ |
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2690 |
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Author |
Gaston, K.J. |
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Title |
Lighting up the nighttime |
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Journal Article |
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Year |
2018 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
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Volume |
362 |
Issue |
6416 |
Pages |
744-746 |
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Keywords |
Commentary |
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Abstract |
Among the most visually compelling images of the whole Earth have been those created using data obtained at night by astronauts or from satellites. The proliferation in use of electric lighting—including from industrial, commercial, municipal, and domestic sources—is striking. It sketches the spatial distribution of much of the human population, outlining a substantial proportion of the world's coastline, highlighting a multitude of towns and cities, and drawing the major highways that connect them. The data embodied in these nighttime images have been used to estimate and map levels of energy use, urbanization, and economic activity. They have also been key in focusing attention on the environmental impacts of the artificial light at night itself. Explicit steps need to be taken to limit these impacts, which vary according to the intensity, spectrum, spatial extent, and temporal dynamics of this lighting. |
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Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall TR10 9FE, UK. k.j.gaston@exeter.ac.uk |
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0036-8075 |
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PMID:30442788 |
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GFZ @ kyba @ |
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2058 |
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Author |
Gaynor, K.M.; Hojnowski, C.E.; Carter, N.H.; Brashares, J.S. |
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Title |
The influence of human disturbance on wildlife nocturnality |
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Journal Article |
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Year |
2018 |
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Science (New York, N.Y.) |
Abbreviated Journal |
Science |
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Volume |
360 |
Issue |
6394 |
Pages |
1232-1235 |
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Rapid expansion of human activity has driven well-documented shifts in the spatial distribution of wildlife, but the cumulative effect of human disturbance on the temporal dynamics of animals has not been quantified. We examined anthropogenic effects on mammal diel activity patterns, conducting a meta-analysis of 76 studies of 62 species from six continents. Our global study revealed a strong effect of humans on daily patterns of wildlife activity. Animals increased their nocturnality by an average factor of 1.36 in response to human disturbance. This finding was consistent across continents, habitats, taxa, and human activities. As the global human footprint expands, temporal avoidance of humans may facilitate human-wildlife coexistence. However, such responses can result in marked shifts away from natural patterns of activity, with consequences for fitness, population persistence, community interactions, and evolution. |
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Department of Environmental Science, Policy, and Management, University of California-Berkeley, Berkeley, CA 94720, USA |
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AAAS |
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0036-8075 |
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PMID:29903973 |
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IDA @ john @ |
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1988 |
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Author |
Rajaratnam, S.M.W.; Arendt, J. |
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Title |
Health in a 24-h society |
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Journal Article |
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Year |
2001 |
Publication |
The Lancet |
Abbreviated Journal |
The Lancet |
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Volume |
358 |
Issue |
9286 |
Pages |
999-1005 |
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Keywords |
Human Health |
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0140-6736 |
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LoNNe @ kagoburian @ |
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856 |
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Author |
Cinzano, P.; Elvidge, C.D. |
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Title |
Night sky brightness at sites from DMSP-OLS satellite measurements |
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Journal Article |
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2004 |
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Monthly Notices of the Royal Astronomical Society |
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MNRAS |
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353 |
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4 |
Pages |
1107-1116 |
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Keywords |
scattering; atmospheric effects; light pollution; site testing; GTOPO30; DMSP |
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We apply the sky brightness modelling technique introduced and developed by Roy Garstang to high-resolution satellite measurements of upward artificial light flux carried out with the US Air Force Defense Meteorological Satellite Program Operational Linescan System and to GTOPO30 (a global digital elevation model by the US Geological Survey's EROS Data Centre) digital elevation data in order to predict the brightness distribution of the night sky at a given site in the primary astronomical photometric bands for a range of atmospheric aerosol contents. This method, based on global data and accounting for elevation, Earth curvature and mountain screening, allows the evaluation of sky glow conditions over the entire sky for any site in the world, to evaluate its evolution, to disentangle the contribution of individual sources in the surrounding territory and to identify the main contributing sources. Sky brightness, naked eye stellar visibility and telescope limiting magnitude are produced as three-dimensional arrays, the axes of which are the position on the sky and the atmospheric clarity. We compare our results with available measurements. |
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0035-8711 |
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IDA @ john @ |
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172 |
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