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Kyba, C.C.M.; Bouroussis, C.; Canal-Domingo, R.; Falchi, F.; Giacomelli, A.; Hänel, A.; Kolláth, Z.; Massetti, L.; Ribas, S.J.; Spoelstra, H.; Tong, K.P.; Wuchterl, G. |
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Report of the 2015 LoNNe Intercomparison Campaign |
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2015 |
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skyglow; instrumentation |
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LoNNe @ kyba @; IDA @ john @; GFZ @ kyba @ |
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1255 |
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Ribas, S. J.; Aubé, M.; Bará, S.; Bouroussis, C.; Canal-Domingo, R.; Espey, B.; Hänel, A.; Jechow, A.; Kolláth, Z.; Marti, G.; Massana, P.; Schmidt, W.; Spoelstra, H.; Wuchterl, G.; Zamorano, J.; Kyba, C. |
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Title |
Report of the 2016 STARS4ALL/LoNNe Intercomparison Campaign |
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Report |
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2017 |
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Skyglow; Instrumentation |
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The 2016 LoNNe (Loss of the Night Network) intercomparison campaign is the fourth of four campaigns planned during EU COST Action ES1204. The first campaign took place in 2013 in Lastovo, Croatia, the second in Madrid, Spain (Bará et al 2015), the third in Torniella and Florence, Italy (Kyba et al 2015a). The 2016 campaign took place at the Parc Astronòmic Montsec (PAM). The campaign continued the strategy of taking measurements at multiple sites, this year with a main fixed site and then excursions to other sites. The goals of the campaigns included:
● Understanding the difference between extinction measurements made by DSLR photometry and classical astronomical (telescope) photometry, and also understanding the relation between extinction and sky brightness at these two sites.
● Examining the difference in radiance measured with the mosaic technique of the US National Parks Service camera compared to all-sky fisheye imagery
● Examining the relationships between all-sky and zenith radiance reported by different instruments
● Quantifying the sky brightnes at the sites, including full zenith spectral radiance at selected locations
● Measuring the systematic uncertainty on handheld SQM observations due to unit-to-unit differences |
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GFZ Data Services |
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GFZ @ kyba @ |
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3057 |
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Hampf, D.; Rowell, G.; Wild, N.; Sudholz, T.; Horns, D.; Tluczykont, M. |
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Title |
Measurement of night sky brightness in southern Australia |
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2011 |
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Advances in Space Research |
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Advances in Space Research |
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48 |
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6 |
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1017-1025 |
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Observatories and site testing; Airglow and aurorae; Photometric, polarimetric, and spectroscopic instrumentation |
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Night sky brightness is a major source of noise both for Cherenkov telescopes as well as for wide-angle Cherenkov detectors. Therefore, it is important to know the level of night sky brightness at potential sites for future experiments.
The measurements of night sky brightness presented here were carried out at Fowler’s Gap, a research station in New South Wales, Australia, which is a potential site for the proposed TenTen Cherenkov telescope system and the planned wide-angle Cherenkov detector system HiSCORE.
A portable instrument was developed and measurements of the night sky brightness were taken in February and August 2010. Brightness levels were measured for a range of different sky regions and in various spectral bands.
The night sky brightness in the relevant wavelength regime for photomultipliers was found to be at the same level as measured in similar campaigns at the established Cherenkov telescope sites of Khomas, Namibia, and at La Palma. The brightness of dark regions in the sky is about 2 × 1012 photons/(s sr m2) between 300 nm and 650 nm, and up to four times brighter in bright regions of the sky towards the galactic plane. The brightness in V band is 21.6 magnitudes per arcsec2 in the dark regions. All brightness levels are averaged over the field of view of the instrument of about 1.3 × 10−3 sr.
The spectrum of the night sky brightness was found to be dominated by longer wavelengths, which allows to apply filters to separate the night sky brightness from the blue Cherenkov light. The possible gain in the signal to noise ratio was found to be up to 1.2, assuming an ideal low-pass filter. |
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Department of Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany |
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0273-1177 |
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IDA @ john @ |
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189 |
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Downey, J.W. |
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Determination of minimum light sense and retinal dark adaptation with presentation of a new type of photometer |
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1919 |
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American Journal of Ophthalmology |
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2 |
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1 |
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13-20 |
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Vision; Instrumentation |
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This paper reviews the principal hypotheses with reference to light and dark adaptation, and suggests a practical photometer, using a radioactive substance as a standard of comparison. With three illustrations, and experimental findings with this instrument. |
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GFZ @ kyba @ |
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2418 |
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Author |
Gu, Y., Uprety, S., Blonski, S., Zhang, B., & Cao, C. |
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Improved algorithm for determining the Visible Infrared Imaging Radiometer Suite Day/Night Band high-gain stage dark offset free from light contamination |
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2019 |
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Applied Optics |
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58 |
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6 |
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1400-1407 |
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Remote Sensing; Instrumentation |
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Dark offset is one of the key parameters for Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB) high-gain stage (HGS) radiometric calibration, whose accuracy strongly impacts applications of DNB low-light detection for Earth observation at nighttime. Currently, DNB observation of the VIIRS onboard calibrator blackbody (OBCBB) view, together with its observation of deep space during the spacecraft pitch maneuver performed early in the mission, has been used to compute the HGS dark offset continuously. However, the relationship between the DNB OBCBB data and the Earth view (EV) data is unclear due to electronic timing differences between these two views. It is questionable whether the DNB OBCBB data can monitor the EV HGS dark offset change. Through comprehensive analysis of the DNB OBCBB data and EV data acquired from the monthly special acquisitions known as the VIIRS recommended operating procedures (VROPs), we have shown that the OBCBB data can only track the dark current component of the DNB HGS EV dark offset, instead of the total dark offset. The DNB observation of deep space during the spacecraft pitch maneuver was also contaminated by starlight. With such background, in this paper we propose an improved algorithm for determining the DNB HGS dark offset. By combined use of the DNB OBCBB data and the DNB VROP data, the generated DNB HGS dark offset is both free from light contamination and capable of tracking continuous drift. The improved algorithm could potentially improve the DNB radiometric performance at low radiance level. Our results provide a solid theoretical basis for dark offset calibration of the VIIRS DNB onboard Suomi National Polar-Orbiting Partnership satellite and the following Joint Polar Satellite System satellites. |
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IDA @ intern @ |
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2358 |
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