| Records |
| Author |
Bará, S. |
| Title |
Black-body luminance and magnitudes per square arcsecond in the Johnson-Cousins BVR photometric bands |
Type |
Journal Article |
| Year |
2019 |
Publication |
Photonics Letters of Poland |
Abbreviated Journal |
Photon. Lett. Pl. |
| Volume |
11 |
Issue |
3 |
Pages |
63 |
| Keywords |
Skyglow; night sky brightness; luminance; photometric |
Abstract  |
A relevant amount of light pollution studies deal with the unwanted visual effects of artificial light at night, including the anthropogenic luminance of the sky that hinders the observation of the celestial bodies which are a main target of ground-based astrophysical research, and a key asset of the intangible heritage of humankind. Most quantitative measurements and numerical models, however, evaluate the anthropogenic sky radiance in any of the standard Johnson-Cousins UBVRI photometric bands, generally in the V one. Since the Johnson-Cousins V band is not identical with the visual CIE V-lambda used to assess luminance, the conversion between these two photometric systems turns out to be spectrum-dependent. Given its interest for practical applications, in this Letter we provide the framework to perform this conversion and the transformation constants for black-body spectra of different absolute temperatures. |
| Address |
Dept. Física Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia |
| Corporate Author |
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Thesis |
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| Publisher |
Photonics Society of Poland |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
English |
Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2080-2242 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
no |
| Call Number |
IDA @ john @ |
Serial |
2685 |
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| Author |
Barducci, A.; Marcoionni, P.; Pippi, I.; Poggesi, M. |
| Title |
Effects of light pollution revealed during a nocturnal aerial survey by two hyperspectral imagers |
Type |
Journal Article |
| Year |
2003 |
Publication |
Applied Optics |
Abbreviated Journal |
Appl. Opt. |
| Volume |
42 |
Issue |
21 |
Pages |
4349 |
| Keywords |
Remote Sensing |
| Abstract |
A remote-sensing campaign was performed in September 2001 at nighttime under clear-sky conditions before moonrise to assess the level of light pollution of urban and industrial origin. Two hyperspectral sensors, namely, the Multispectral Infrared and Visible Imaging Spectrometer and the Visible Infrared Scanner-200, which provide spectral coverage from the visible to the thermal infrared, were flown over the Tuscany coast (Italy) on board a Casa 212 airplane. The acquired images were processed to produce radiometrically calibrated data, which were then analyzed and compared with ground-based spectral measurements. Calibrated data acquired at high spectral resolution (∼2.5 nm) showed a maximum scene brightness almost of the same order of magnitude as that observed during similar daytime measurements, whereas their average luminosity was 3 orders of magnitude lower. The measurement analysis confirmed that artificial illumination hinders astronomical observations and produces noticeable effects even at great distances from the sources of the illumination. |
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Place of Publication |
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Summary Language |
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Original Title |
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Series Title |
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Series Issue |
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Edition |
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| ISSN |
0003-6935 |
ISBN |
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Medium |
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| Notes |
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Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
2438 |
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| Author |
Elvidge, C.D.; Ghosh, T.; Hsu, F.-C.; Zhizhin, M.; Bazilian, M. |
| Title |
The Dimming of Lights in China during the COVID-19 Pandemic |
Type |
Journal Article |
| Year |
2020 |
Publication |
Remote Sensing |
Abbreviated Journal |
Remote Sensing |
| Volume |
12 |
Issue |
17 |
Pages |
2851 |
| Keywords |
Remote Sensing; VIIRS; Day-night band (DNB); Nighttime lights; COVID-19; Pandemic; VIIRS-DNB |
| Abstract |
A satellite survey of the cumulative radiant emissions from electric lighting across China reveals a large radiance decline in lighting from December 2019 to February 2020—the peak of the lockdown established to suppress the spread of COVID-19 infections. To illustrate the changes, an analysis was also conducted on a reference set from a year prior to the pandemic. In the reference period, the majority (62%) of China’s population lived in administrative units that became brighter in March 2019 relative to December 2018. The situation reversed in February 2020, when 82% of the population lived in administrative units where lighting dimmed as a result of the pandemic. The dimming has also been demonstrated with difference images for the reference and pandemic image pairs, scattergrams, and a nightly temporal profile. The results indicate that it should be feasible to monitor declines and recovery in economic activity levels using nighttime lighting as a proxy. |
| Address |
Earth Observation Group, Payne Institute for Public Policy, Colorado School of Mines, Golden, CO 80401, USA; celvidge(at)mines.edu |
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Thesis |
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| Publisher |
MDPI |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
English |
Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2072-4292 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
no |
| Call Number |
IDA @ john @ |
Serial |
3134 |
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| Author |
Ishikawa, R.; Shinomura, T.; Takano, M.; Shimamoto, K. |
| Title |
Phytochrome dependent quantitative control of Hd3a transcription is the basis of the night break effect in rice flowering |
Type |
Journal Article |
| Year |
2009 |
Publication |
Genes & Genetic Systems |
Abbreviated Journal |
Genes Genet Syst |
| Volume |
84 |
Issue |
2 |
Pages |
179-184 |
| Keywords |
Plants; Flowers/*genetics/growth & development; Gene Expression Regulation, Developmental/drug effects; Gene Expression Regulation, Plant/drug effects; Light; Mutation; Oryza/*genetics/growth & development; Photoperiod; Phytochrome B/genetics/*physiology; Plant Proteins/*genetics; Transcription, Genetic |
| Abstract |
A short exposure to light during relative night (night break; NB) delays flowering in the short day plant rice. NB acts by downregulating Heading date 3a (Hd3a) expression. Because phytochrome B mutants do not respond to NB and their flowering time is not affected even under NB conditions, phyB is required for the suppression of Hd3a expression. The effect of NB is quantitatively controlled by light quality and by either light intensity or duration. However, the molecular mechanisms that regulate these interactions are poorly understood. Here, we examine the roles of phytochromes in the regulation of Hd3a transcription under NB conditions using monochromatic red, far-red and blue light. Red and blue light downregulated Hd3a expression, but far-red light NB did not. The effect of red light NB on Hd3a is dependent on photon fluence and is restored by subsequent far-red light irradiation. Our results suggest that quantitative effect of light on flowering in rice NB is mediated by the regulation of Hd3a transcription by phyB. |
| Address |
Laboratory of Plant Molecular Genetics, Nara Institute of Science and Technology, Takayama, Ikoma, Japan |
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| Language |
English |
Summary Language |
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Edition |
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| ISSN |
1341-7568 |
ISBN |
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| Notes |
PMID:19556711 |
Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
3345 |
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| Author |
Kinzey, B.R.; Perrin, T.E.; Miller, N.J.; Kocifaj, M.; Aubé, M.; Lamphar, H.A. |
| Title |
An investigation of LED street lighting's impact on sky glow |
Type |
Journal Article |
| Year |
2017 |
Publication |
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Abbreviated Journal |
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| Volume |
PNNL-26411 |
Issue |
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Pages |
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| Keywords |
Skyglow; Lighting |
| Abstract |
A significant amount of public attention has recently focused on perceived impacts of converting street lighting from incumbent lamp-based products to LED technology. Much of this attention pertains to the higher content of short wavelength light (commonly referred to as “blue light”) of LEDs and its attendant influences on sky glow (a brightening of the night sky that can interfere with astronomical observation and may be associated with a host of other issues). The complexity of this topic leads to common misunderstandings and misperceptions among the public, and for this reason the U.S. Department of Energy Solid-State Lighting Program embarked on a study of sky glow using a well-established astronomical model to investigate some of the primary factors influencing sky glow. This report details the results of the investigation and attempts to present those results in terms accessible to the general lighting community. The report also strives to put the results into a larger context, and help educate interested readers on various topics relevant to the issues being discussed. |
| Address |
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| Corporate Author |
Pacific Northwest National Lab. (PNNL), Richland, WA (United States) |
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| Notes |
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no |
| Call Number |
GFZ @ kyba @ |
Serial |
2014 |
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