Results 21 to 30 of about 65,204 (171)

Artificial light alters natural regimes of night-time sky brightness [PDF]

open access: yes, 2015
PMCID: PMC3634108Open access journalArtificial light is globally one of the most widely distributed forms of anthropogenic pollution. However, while both the nature and ecological effects of direct artificial lighting are increasingly well documented ...
Bennie, Jonathan   +3 more
core   +1 more source

Artificial light at night is a top predictor of bird migration stopover density

open access: yesNature Communications, 2023
As billions of nocturnal avian migrants traverse North America, twice a year they must contend with landscape changes driven by natural and anthropogenic forces, including the rapid growth of the artificial glow of the night sky.
Kyle G. Horton   +9 more
doaj   +1 more source

Sensitivity of CCD matrices with electronic multiplication

open access: yesTekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2018
The sensitivity and basic electrical characteristics of the developed direct illumination matrices with charge-coupled devices and electronic multiplication were investigated at room temperatures and low illumination. Photomatrices of 576×288 and 640×512
F. F. Sizov   +5 more
doaj   +1 more source

The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds [PDF]

open access: yesAnnales Geophysicae, 2005
An anomalous red glow due to scattered sunlight was observed at Longyearbyen (78° N, 15° E) on 6 December 2002 from 07:30 UT to 13:30 UT when the solar zenith angle varied between 100.7° and 104°.
N. D. Lloyd   +4 more
doaj   +1 more source

Measurements of the Diffuse Ultraviolet Background and the Terrestrial Airglow with the Space Telescope Imaging Spectrograph [PDF]

open access: yes, 2000
Far-UV observations in and near the Hubble Deep Fields demonstrate that the Space Telescope Imaging Spectrograph (STIS) can potentially obtain unique and precise measurements of the diffuse far-ultraviolet background.
Eastes R. W.   +7 more
core   +2 more sources

All-sky Relative Opacity Mapping Using Night Time Panoramic Images

open access: yes, 2005
An all-sky cloud monitoring system that generates relative opacity maps over many of the world's premier astronomical observatories is described.
Ananthasubramanian P. G.   +8 more
core   +2 more sources

Tile or Stare? Cadence and Sky Monitoring Observing Strategies that Maximize the Number of Discovered Transients [PDF]

open access: yes, 2003
To maximize the number of transients discovered on the sky, should sky-monitoring projects stare at one location or continually jump from location to location, tiling the sky? If tiling is preferred, what cadence maximizes the discovery rate?
Nemiroff, Robert J.
core   +3 more sources

Cloud coverage acts as an amplifier for ecological light pollution in urban ecosystems.

open access: yesPLoS ONE, 2011
The diurnal cycle of light and dark is one of the strongest environmental factors for life on Earth. Many species in both terrestrial and aquatic ecosystems use the level of ambient light to regulate their metabolism, growth, and behavior.
Christopher C M Kyba   +3 more
doaj   +1 more source

The Spectrum of the Night Sky Over Kitt Peak: Changes Over Two Decades

open access: yes, 2010
New absolute spectrophotometry of the Kitt Peak night sky has been obtained in 2009/10, which we compare to previously published data obtained in 1988 and 1999, allowing us to look for changes over the past two decades.
Massey, Philip, Neugent, Kathryn F
core   +1 more source

Night sky brightness at sites from DMSP-OLS satellite measurements

open access: yes, 2004
We apply the sky brightness modelling technique introduced and developed by Roy Garstang to high-resolution DMSP-OLS satellite measurements of upward artificial light flux and to GTOPO30 digital elevation data in order to predict the brightness ...
Abramowitz   +52 more
core   +1 more source

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