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Author Bará, S.
Title (down) Variations on a classical theme: On the formal relationship between magnitudes per square arcsecond and luminance Type Journal Article
Year 2017 Publication International Journal of Sustainable Lighting Abbreviated Journal Intl J of Sustainable Lighting
Volume 19 Issue 2 Pages 77
Keywords Instrumentation; skyglow; luminance; magnitude; sky brigthness; photometry
Abstract The formal link between magnitudes per square arcsecond and luminance is discussed in this paper. Directly related to the human visual system, luminance is defined in terms of the spectral radiance of the source, weighted by the CIE V(l) luminous efficiency function, and scaled by the 683 lm/W luminous efficacy constant. In consequence, any exact and spectrum-independent relationship between luminance and magnitudes per square arcsecond requires that the last ones be measured precisely in the CIE V(l) band. The luminance value corresponding to mVC=0 (zero-point of the CIE V(l) magnitude scale) depends on the reference source chosen for the definition of the magnitude system. Using absolute AB magnitudes, the zero point luminance of the CIE V(l) photometric band is 10.96 x 104 cd·m-2.
Address Departamento de Física Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain; salva.bara(at)usc.es
Corporate Author Thesis
Publisher Place of Publication Editor
Language English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2586-1247 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 2162
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Author Matalin, A. V.
Title (down) Variations in flight ability with sex and age in ground beetles ( Coleoptera , Carabidae ) of south-western Moldova Type Journal Article
Year 2003 Publication Pedobiologia Abbreviated Journal
Volume 47 Issue 4 Pages 311–320
Keywords Animals
Abstract On the basis of morphometric measurements of 69 Carabidae species, the dispersal power of beetles at different stages of

their physiological development was estimated. As quantitative criteria for estimation of dispersal possibilities the indices

of potential migrants (

Ipm

) and conventional load on the wing (

Pf

) were introduced. Among constantly macropterous cara-

bids, three groups of beetles with different levels of wing muscles development were distinguished. Monomorphic

macropterous (MMm) species are characterized by the highest flight activity of both sexes throughout imago stage. Though

in many di(poly)morphic carabids (DPM species) a proportion of macropterous females in the populations is large, the wing

muscles are better developed in macropterous males, which ensures similar migration possibilities of males and females.

In populations of polymorphic macropterous (MPm) and DPM species dispersion is carried out mostly by teneral and im-

mature beetles. The maximum loss in flight ability occurs in mature females with developed eggs in ovaries. Large species

of ground beetles produce relatively large eggs, which are deposited in a single batch. After the development of gonads,

body mass in these species increases sharply, while wing muscles decline. In small-sized carabid species gonads develop

gradually and they lay relatively small eggs continuously. The changes in body mass in these species are usually small.

Therefore, the temporal changes in the

Pf

-index are more pronounced in large- and medium-sized carabid species com-

pared to small-sized beetles. The dispersal power of carabid beetles in different regions is discussed.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number LoNNe @ kagoburian @ Serial 609
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Author Spitschan, M.; Aguirre, G.K.; Brainard, D.H.; Sweeney, A.M.
Title (down) Variation of outdoor illumination as a function of solar elevation and light pollution Type Journal Article
Year 2016 Publication Scientific Reports Abbreviated Journal Sci Rep
Volume 6 Issue Pages 26756
Keywords Skyglow; Measurements; light pollution; daylight; twilight; sky brightness; spectral irradiance; CIE
Abstract The illumination of the environment undergoes both intensity and spectral changes during the 24 h cycle of a day. Daylight spectral power distributions are well described by low-dimensional models such as the CIE (Commission Internationale de l'Eclairage) daylight model, but the performance of this model in non-daylight regimes is not characterised. We measured downwelling spectral irradiance across multiple days in two locations in North America: One rural location (Cherry Springs State Park, PA) with minimal anthropogenic light sources, and one city location (Philadelphia, PA). We characterise the spectral, intensity and colour changes and extend the existing CIE model for daylight to capture twilight components and the spectrum of the night sky.
Address Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
Corporate Author Thesis
Publisher Nature Place of Publication Editor
Language English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2045-2322 ISBN Medium
Area Expedition Conference
Notes PMID:27272736 Approved no
Call Number IDA @ john @ Serial 1464
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Author Coesfeld, J.; Anderson, S.; Baugh, K.; Elvidge, C.; Schernthanner, H.; Kyba, C.
Title (down) Variation of Individual Location Radiance in VIIRS DNB Monthly Composite Images Type Journal Article
Year 2018 Publication Remote Sensing Abbreviated Journal Remote Sensing
Volume 10 Issue 12 Pages 1964
Keywords Remote Sensing; Instrumentation
Abstract With the growing size and use of night light time series from the Visible Infrared Imaging Radiometer Suite Day/Night Band (DNB), it is important to understand the stability of the dataset. All satellites observe differences in pixel values during repeat observations. In the case of night light data, these changes can be due to both environmental effects and changes in light emission. Here we examine the stability of individual locations of particular large scale light sources (e.g., airports and prisons) in the monthly composites of DNB data from April 2012 to September 2017. The radiances for individual pixels of most large light emitters are approximately normally distributed, with a standard deviation of typically 15–20% of the mean. Greenhouses and flares, however, are not stable sources. We observe geospatial autocorrelation in the monthly variations for nearby sites, while the correlation for sites separated by large distances is small. This suggests that local factors contribute most to the variation in the pixel radiances and furthermore that averaging radiances over large areas will reduce the total variation. A better understanding of the causes of temporal variation would improve the sensitivity of DNB to lighting changes.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2072-4292 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2129
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Author De Miguel, A.
Title (down) Variaci{ó}n del brillo del fondo de cielo en el c{é}nit con la fase y altura de la Luna. Type Journal Article
Year 2012 Publication Abbreviated Journal
Volume Issue Pages
Keywords Remote Sensing
Abstract
Address
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number LoNNe @ kagoburian @ Serial 922
Permanent link to this record