Results 21 to 30 of about 4,658 (241)
Sky brightness measurements for different environmental conditions by the example of St. Petersburg
SHS Web of Conferences, 2018 St. Petersburg is unique place in Russia with an environmental phenomenon called “white nights” during summertime: sky brightness levels are influenced mostly by environmental conditions.
Kolgushkina Svetlana
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GROUND-BASED CLOUD OBSERVATION FOR SATELLITE-BASED CLOUD DISCRIMINATION AND ITS VALIDATION [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2012 Solar radiation is a source of energy for ground surfaces. Clouds control energy budget on both local and global scales. We propose the simple ground-based observation method for various sky conditions instead of the existing visual observation. In the
M. Yamashita, M. Yoshimura
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Odessa Astronomical Publications, 2017 Use of a twilight sounding method of the Earth's atmosphere with the aim to reveal aerosols inflow to the upper and medial atmosphere needs a method of separation twilight sky brightness to the brightness of primary and secondary twilight.
L. S. Shakun +2 more
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Surveying the Bright Sky [PDF]
Proceedings of the International Astronomical Union, 2011 AbstractThe AAVSO is initiating a new survey of the sky. It will cover the entire visible sky, both north and south, on a daily basis, in two colours, and with a limiting magnitude of V = 17. This will be a perfect complement to LSST, but will be available years earlier and will continue into the indefinite future.
openaire +1 more source
Classification of Continuous Sky Brightness Data Using Random Forest
Advances in Astronomy, 2020 Sky brightness measuring and monitoring are required to mitigate the negative effect of light pollution as a byproduct of modern civilization. Good handling of a pile of sky brightness data includes evaluation and classification of the data according to ...
Rhorom Priyatikanto +3 more
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Jurnal Kumparan Fisika, 2021 ABSTRAK Dalam penelitian ini akan diukur tingkat kecerahan langit untuk mengetahui waktu hilangnya syafaq ( cahaya merah ) yang ada dilangit pada waktu malam hari.
M. Asep Rizkiawan +2 more
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Auroral all-sky camera calibration [PDF]
Geoscientific Instrumentation, Methods and Data Systems, 2014 A two-step procedure to calibrate the spectral sensitivity to visible light of auroral all-sky cameras is outlined. Center pixel response is obtained by the use of a Lambertian surface and a standard 45 W tungsten lamp.
F. Sigernes +14 more
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COMPARISON OF NIGHT SKY BRIGHTNESS ABOVE ZAGREB AND A NEARBY RURAL LOCATION 2014-2017
Rudarsko-geološko-naftni Zbornik, 2020 The results of monitoring light pollution near the center of Zagreb at the Faculty of Mining, Geology and Petroleum Engineering (RGN) for the period 2012 - 2017 were presented in a recent article (Andreić, 2018).
Krešimir Pavlić, Željko Andreić
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The moon phases influence on the beginning of astronomical dawn determination in Yogyakarta
International Journal of Science and Applied Science: Conference Series, 2017 In astronomy, there are three types of dawn. They are astronomical, nautical, and civil dawn. The sunlight is starting to appear on the east horizon when the Sun altitude is 18o below the horizon. Hence, there is a change on the sky brightness.
Abu Yazid Raisal +3 more
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Artificial light at night correlates with seabird groundings: mapping city lights near a seabird breeding hotspot [PDF]
PeerJ, 2022 Artificial light at night (ALAN) is a growing conservation concern for seabirds, which can become disoriented and grounded by lights from buildings, bridges and boats. Many fledgling seabirds, especially Procellariiformes such as petrels and shearwaters,
Ariel-Micaiah Heswall +6 more
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