| Records |
Author  |
Cavazzani, S.; Ortolani, S.; Bertolo, A.; Binotto, R.; Fiorentin, P.; Carraro, G.; Zitelli, V. |
| Title |
Satellite measurements of artificial light at night: aerosol effects |
Type |
Journal Article |
| Year |
2020 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
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| Volume |
499 |
Issue |
4 |
Pages |
5075-5089 |
| Keywords |
Instrumentation; atmospheric effects; detectors; light pollution; site testing; Aerosols |
| Abstract |
The study of artificial light at night (ALAN) by satellite is very important for the analysis of new astronomical sites and for the long-term temporal evolution observation of the emission from the ground. The analysis of satellite data presents many advantages but also some critical points because of fluctuations in measurements. The main result of this paper is the discovery of a correlation between these fluctuations and the aerosol concentration combined with cloud cover and lunar cycles. In this work, we also present a mathematical empirical model for the light pollution propagation study in relation to the aerosol concentration detected by satellite. We apply this model to the astronomical site of Asiago (Ekar Observatory) providing a possible explanation for the temporal ALAN fluctuations detected by satellite. Finally, we validate the results with the ground collected data. |
| Address |
Department of Physics and Astronomy, University of Padova, Vicolo dell’Osservatorio 3, I-35122 Padova, Italy; stefano.cavazzani ( at ) unipd.it |
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Oxford Academic |
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English |
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English |
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| ISSN |
0035-8711 |
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no |
| Call Number |
IDA @ john @ |
Serial |
3310 |
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| Author |
Chen, H.; Xiong, X.; Geng, X.; Twedt, K. |
| Title |
Stray-light correction and prediction for Suomi National Polar-orbiting Partnership visible infrared imaging radiometer suite day-night band |
Type |
Journal Article |
| Year |
2019 |
Publication |
Journal of Applied Remote Sensing |
Abbreviated Journal |
J. Appl. Rem. Sens. |
| Volume |
13 |
Issue |
02 |
Pages |
1 |
| Keywords |
Instrumentation; Remote Sensing |
| Abstract |
The Suomi National Polar-orbiting Partnership visible infrared imaging radiometer suite instrument has successfully operated since its launch in October 2011. Stray-light contamination is much larger than prelaunch expectations, and it causes a major decrease in quality of the day-night band night imagery when the spacecraft is crossing the Northern or Southern day-night terminators. The stray light can be operationally estimated using Earth-view data that are measured over dark surfaces during the new moon each month. More than 7 years of nighttime images have demonstrated that the stray-light contamination mainly depends on the Earth–Sun–spacecraft geometry, so its intensity is generally estimated as a function of the satellite zenith angle. In practice, stray-light contamination is also detector- and scan-angle-dependent. Previous methods of stray-light prediction generally rely on using the known stray light level from the same month in the previous year, when the Earth–Sun–spacecraft geometries had been similar. We propose a new method to predict stray-light contamination. The Kullback–Leibler similarity metric is used as a method to combine data from multiple years with appropriate adjustments for degradation and geometry drifts in order to calculate a fused stray-light contamination correction. The new method provides an improved prediction of stray-light contamination compared to the existing methods and may be considered for future use in the real-time NASA Level-1B products. |
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1931-3195 |
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no |
| Call Number |
GFZ @ kyba @ |
Serial |
2517 |
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| Author |
Choi, T.; Shao, X.; Cao, C.; Weng, F. |
| Title |
Radiometric Stability Monitoring of the Suomi NPP Visible Infrared Imaging Radiometer Suite (VIIRS) Reflective Solar Bands Using the Moon |
Type |
Journal Article |
| Year |
2016 |
Publication |
Remote Sensing |
Abbreviated Journal |
Remote Sensing |
| Volume |
8 |
Issue |
1 |
Pages |
15 |
| Keywords |
Instrumentation |
| Abstract |
The Suomi NPP (S-NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) performs the scheduled lunar roll maneuver on a monthly basis. The lunar calibration coefficients and lunar F-factor are calculated by taking the ratio of the lunar observed radiance to the simulated radiance from the Miller and Turner (MT) lunar model. The lunar F-factor is also validated against that derived from the VIIRS Solar Diffuser (SD). The MT model-based lunar F-factors in general agree with SD F-factors. The Lunar Band Ratio (LBR) is also derived from two channel lunar radiances and is implemented in the National Oceanic and Atmospheric Administration (NOAA) Integrated Calibration and Validation System (ICVS) to monitor the VIIRS long-term radiometric performance. The lunar radiances at pixels are summed for each of the VIIRS Reflective Solar Bands (RSBs) and normalized by the reference band M11 which has the most stable SD-based calibration coefficient. LBRs agree with the SD based F-factor ratios within one percent. Based on analysis with these two independent lunar calibration methods, SD-based and LBR-based calibrations show a lifetime consistency. Thus, it is recommended that LBR be used for both VIIRS radiometric calibration and lifetime stability monitoring. |
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| ISSN |
2072-4292 |
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no |
| Call Number |
LoNNe @ kyba @ |
Serial |
1384 |
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| Author |
Cinzano, P. |
| Title |
Night Sky Photometry with Sky Quality Meter |
Type |
Journal Article |
| Year |
2005 |
Publication |
Technical Report 9, ISTIL. V1.4. |
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Issue |
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Pages |
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| Keywords |
Instrumentation; light pollution; night sky brightness; photometry; instruments; calibration |
| Abstract |
Sky Quality Meter, a low cost and pocket size night sky brightness photometer, opens to the general public the possibility to quantify the quality of the night sky. Expecting a large diffusion of measurements taken with this instrument, I tested and characterized it. I analyzed with synthetic photometry and laboratory measurements the relationship between the SQM photometrical system and the main systems used in light pollution studies. I evaluated the conversion factors to Johnson’s B and V bands, CIE photopic and CIE scotopic responses for typical spectra and the spectral mismatch correction factors when specific filters are added. |
| Address |
Dipartimento di Astronomia, Vicolo dell’Osservatorio 2, I-35100 Padova, Italy; cinzano(at)lplab.it |
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ISTIL |
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English |
Summary Language |
English |
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LoNNe @ christopher.kyba @ |
Serial |
473 |
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| Author |
Cinzano, P.; Falchi, F. |
| Title |
A portable wide-field instrument for mapping night sky brightness automatically |
Type |
Journal Article |
| Year |
2003 |
Publication |
Memorie della Società Astronomica Italiana |
Abbreviated Journal |
Mem. S.A. It. |
| Volume |
74 |
Issue |
2 |
Pages |
458-459 |
| Keywords |
Instrumentation; all-sky; photometry; sky brightness |
| Abstract |
We present a portable automatic instrument for monitoring night sky brightness and atmospherical transparency in astronomical photometrical bands. Main requirements were: fast and automatic coverage of the entire sky, lightness, transportability and quick set-up in order to take measurements from more sites in the same night, easily available commercial components and software to be reproduced by any interested institution, included amateurs astronomers groups. |
| Address |
Istituto di Scienza e Tecnologia dell’Inquinamento Luminoso, Thiene, Italy |
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| Publisher |
Società Astronomica Italiana |
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| Language |
English |
Summary Language |
English |
Original Title |
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Series Issue |
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Edition |
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| ISSN |
1824-016X |
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no |
| Call Number |
IDA @ john @ |
Serial |
2243 |
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