Results 11 to 20 of about 477,612 (260)
Applied Sciences, 2023 The present study is aimed at the development of a novel empirical base for application to ground-based astronomical telescopes. A Weather Research and Forecasting (WRF) model is used for description of atmospheric flow structure with a high spatial ...
A. Y. Shikhovtsev +11 more
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Astronomical seeing from the summits of the Antarctic plateau [PDF]
Astronomy & Astrophysics, 2002 From the South Pole, microthermal turbulence within a narrow surface boundary layer some 200m thick provides the dominant contribution to the astronomical seeing. We present results for the seeing at a wavelength of 2.4um. The narrow turbulence layer above the site, confined close to the surface, provides greatly superior conditions for adaptive optics
R. D. Marks
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Astronomical seeing and ground-layer turbulence in the Canadian High Arctic [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 We report results of a two-year campaign of measurements, during arctic winter darkness, of optical turbulence in the atmospheric boundary-layer above the Polar Environment Atmospheric Laboratory in northern Ellesmere Island (latitude +80 deg N).
Hickson, P. +3 more
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Astronomical Seeing Prediction with Machine Learning
Research Notes of the AASAbstract We investigate the use of supervised machine learning models to predict current atmospheric seeing at the Observatorio del Roque de Los Muchachos, La Palma. The prediction is made from current, local meteorological conditions as measured by an on-site weather station.
Fernando Abárzuza +5 more
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رصد الأهلة في ظل تطور علوم الفلك والفضاء دراسة فقهية [PDF]
مجلة الشريعة والقانون بالقاهرة, 2023 خَلَصَ هذا البحثُ إلى أنَّ علمَ الفلكِ وسيلةٌ لترسيخِ الإيمانِ بالخالقِ-سبحانهُ-، من خلالِ الاطِّلاعِ على هذا الكونِ المُتَرَامِي الأطرافَ إضافةً لارتباطِ هذا العلمِ بعباداتِ وأحوالِ شرعيَّةٍ تم توقيتُهَا بأزمنةٍ محددةٍ، متمثلةً في بداياتِ الشهورِ العربيّ
منى سالم محمد السيد محمد سلام
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Neural Network Based Point Spread Function Deconvolution For Astronomical Applications
The Open Journal of Astrophysics, 2023 Optical astronomical images are strongly affected by the point spread function (PSF) of the optical system and the atmosphere (seeing) which blurs the observed image.
Hong Wang +5 more
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On the Impact of ENSO Cycles and Climate Change on Telescope Sites in Northern Chile
Atmosphere, 2023 The Atacama desert stands as the most arid, non-polar, region on Earth and has accommodated a considerable portion of the world’s ground-based astronomical observatories for an extended period.
Julia Victoria Seidel +2 more
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First day-time seeing observations at the Observatory of University of Zanjan in Iran [PDF]
Iranian Journal of Astronomy and Astrophysics, 2018 Recognition of the appropriate locations for ground-based observations of the Sun with high angular resolution depends on the factors such as seeing, meteorological and astronomical parameters.
Pardis Ahmadi +3 more
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THE PROBABILITY OF SEEING THE CRESCENT WITH THE NAKED EYE. [PDF]
مجلة جامعة الانبار للعلوم الصرفة, 2012 The aim of this study is to improve the static equation of the possibility of seeing the crescent. The factors (age of the moon, moon altitude, anomaly of the sun, the duration of stay Crescent (mukth)) for many years from (2004 to 2013 A.D) has been ...
BATOOL A. BENDER, MAJEED M. JARAD
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Method for Measuring the Second-Order Moment of Atmospheric Turbulence
Atmosphere, 2021 The turbulence moment of order m (μm) is defined as the refractive index structure constant Cn2 integrated over the whole path z with path-weighting function zm. Optical effects of atmospheric turbulence are directly related to turbulence moments.
Hong Shen +3 more
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