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Nawar, S.; Morcos, A. B.

doi:10.1023/a:1001854214366

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…10. The left panel shows map predictions versus artificial night sky brightness measurements at the bottom of the atmosphere taken in clean or photometric nights in the V band for Europe (filled squares), North America (open triangles), South America (open rhombi), Africa (filled triangles) and Asia (filled circle) (Catanzaro & Catalano 2000; Della Prugna 1999; Falchi 1998; Favero et al 2000; Massey & Foltz 2000; Nawar et al 1998a; Nawar, Morcos & Mikhail 1998b; Piersimoni, Di Paolantonio & Brocato 2000; Poretti & Scardia 2000; Zitelli 2000). All of them have been taken in , except those for Europe which have been taken in and rescaled to by subtracting 20 per cent in order to account approximately for the growth of light pollution in two years.…”

Section: Resultsmentioning

confidence: 99%

The first World Atlas of the artificial night sky brightness

Cinzano

Falchi

Elvidge

2001

Monthly Notices of the Royal Astronomical Society

623

444

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A B S T R A C TWe present the first World Atlas of the zenith artificial night sky brightness at sea level. Based on radiance-calibrated high-resolution DMSP satellite data and on accurate modelling of light propagation in the atmosphere, it provides a nearly global picture of how mankind is proceeding to envelop itself in a luminous fog. Comparing the Atlas with the United States Department of Energy (DOE) population density data base, we determined the fraction of population who are living under a sky of given brightness. About two-thirds of the World population and 99 per cent of the population in the United States (excluding Alaska and Hawaii) and European Union live in areas where the night sky is above the threshold set for polluted status. Assuming average eye functionality, about one-fifth of the World population, more than two-thirds of the United States population and more than one half of the European Union population have already lost naked eye visibility of the Milky Way. Finally, about onetenth of the World population, more than 40 per cent of the United States population and one sixth of the European Union population no longer view the heavens with the eye adapted to night vision, because of the sky brightness.

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Section: Resultsmentioning

confidence: 99%

The first World Atlas of the artificial night sky brightness

Cinzano

Falchi

Elvidge

2001

Monthly Notices of the Royal Astronomical Society

623

444

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“…Since the 1990s, new cities have been constructed near the observatory site until recently in 2016, the New Administrative Capital city was set to be constructed only about 13 km away west the observatory. Only few observations have been carried out at Kottamia observatory using a semi-automatic photoelectric photometer 1,21,22 . The observations were carried out in either two (BV) or three lters (BVR).…”

Section: Methods and Resultsmentioning

confidence: 99%

“…The observations were intended to study the variation of the sky brightness at the site. Since 1995, there are no observations at the Kottamia site 22 .…”

Section: Methods and Resultsmentioning

confidence: 99%

UBVRI night sky brightness at Kottamia Astronomical Observatory

Aboushelib

Morcos

Nawar

et al. 2023

Preprint

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Using a customized fully automatic photoelectric photometer, we measured the NSB in UBVRI filters at Kottamia Astronomical Observatory. The observations covered all the sky at all altitudes and azimuths with 10° steps at each. The observations were carried out on three nights of August, 1st, 2nd and 3rd 2022 and were averaged. The average zenith sky brightness is 20.49, 20.7, 19.34, 18.25 and 17.04 mag/arcsec2 in UBVRI filters respectively. The average color index is U-B = - 0.21, B-V = 1.37, V-R = 1.09 and R-I = 1.21 for the zenith. The average atmospheric extinction and sky transparency of the UBVRI filters were determined for the three nights of observations. We also included the atmospheric conditions during the observational nights.

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“…The elevation of each site is included. Site Elevation (meter) NSB (mag/arcsec 2 ) U B V R I Catania (Italy) 18 1735 21.37 21.13 20.8 – – Mauna Kea (USA) 21 2800 – 22.87 21.91 – – Calar Alto (Spain) 22 2168 22.39 22.86 22.01 21.36 19.25 Paranal (Chile) 32 2635 22.3 22.6 21.6 20.9 19.7 Kottamia (Egypt) 35 480 – 22.5 21.51 20.57 – Abu Simble (Egypt) 43 270 – 22.58 21.66 – – Kottamia (Egypt) Current work 480 20.49 20.38 19.41 18.6 17.94 …”

Section: Analysis Of the Errors On The Resultsmentioning

confidence: 99%

UBVRI night sky brightness at Kottamia Astronomical Observatory

Aboushelib,

Morcos,

Nawar

et al. 2023

Sci Rep

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Photoelectric observations of night sky brightness (NSB) at different zenith distances and azimuths, covering all the sky, at the Egyptian Kottamia Astronomical observatory (KAO) site of coordinates ϕ = 29° 55.9′ N and λ = 31° 49.5′ E, were done using a fully automated photoelectric photometer (FAPP). The Bessel wide range system (UBVRI) is used for the first time to observe NSB for three consecutive nights (1–3 August, 2022) under good seeing conditions after the moon sets. The deduced results were taken in photons and converted into mag/arcsec2. The average zenith sky brightness for U, B, V, R and I filters are found to be 20.49, 20.38, 19.41, 18.60 and 17.94 mag/arcsec2 respectively. The average color indices (U–B), (B–V), (V–R) and (R–I), at the zenith are detected to be 0.11, 0.98, 0.81 and 0.66, respectively. We plotted the isophotes of the sky brightness at KAO in U, B, V, R and I colors (filters) and determined both the average atmospheric extinction and sky transparency through these UBVRI filters. The atmospheric and other meteorological conditions were taken into our consideration during the observational nights. The results of the current study illustrate the main impact of the new cities built around KAO on the sky glow over it, and which astronomical observations are affected.

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Cited by 5 publications

References 5 publications

The first World Atlas of the artificial night sky brightness

The first World Atlas of the artificial night sky brightness

UBVRI night sky brightness at Kottamia Astronomical Observatory

UBVRI night sky brightness at Kottamia Astronomical Observatory

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