Journal ArticleDOI
Optical Response of the Atmosphere During the Caribbean Total Solar Eclipses of 26 February 1998 and of 3 February 1916 at Falcón state, Venezuela
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TLDR
In this article, an investigation of the optical response of the atmosphere before, during, and after the total solar eclipse of 26 February 1998 at the Caribbean Peninsula of Paraguana (Falcon State) in Venezuela, was made by measuring photometrically the intensity of the sky brightness in three strategic directions: zenith, horizon anti-parallel or opposite the umbra path, and horizon perpendicular to this path.Abstract:
An investigation of the optical response of the atmosphere before, during, and afterthe total solar eclipse of 26 February 1998 at the Caribbean Peninsula of Paraguana (Falcon State) in Venezuela, was made by measuring photometrically the intensity of the sky brightness in three strategic directions: zenith, horizon anti-parallel or opposite the umbra path, and horizon perpendicular to this path. From these measurements, and by applying in an inverse way an empirical photometric model, very rough estimations of theextinction coefficient, and also of the average optical depth, were obtained in one of these particular directions. However based on meteorological measurements such as those of relative humidity and temperature, and applying a different model, a better estimation in the visual of the total global extinction coefficient of the sky (except the horizon), were made considering the contribution of each component: atmospheric aerosol, water vapour, ozone and Rayleigh scattering. It is shown that this global coefficient is mostly dependent upon aerosol extinction. In spite of the strong reduction of sky brightness photometrically observed during the totality, the results show that the sky was not dark. This is confirmed by the results obtained for the total global extinction coefficient. Additionally it is estimated that the total solar eclipse that took place also in Falcon State, Venezuela, at the beginning of the last century on 3 February 1916, was ∼30% darker that the 1998 eclipse, and that atmospheric aerosol played a relevant and similar role in the scattering of sunlight during the totality as it was for 1998's. Visual observations made during each event, which show that at length only one or two bright stars could be seen in the sky, support the results obtained for both eclipses.read more
Citations
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References
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TL;DR: The distance at which a given object can be seen through the atmosphere is a function of three variables: (1) the optical properties of the atmosphere, (2) the properties of object itself and of its background, and (3) the state of adaptation of the eyes of the observer as discussed by the authors.
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Chemical and size effects of hygroscopic aerosols on light scattering coefficients
TL;DR: In this paper, a visibility model for computing light scattering by hygroscopic aerosols is proposed, based on 1 μg dry salt per cubic meter of air, calculated as a function of relative humidity for aerosols of various chemical compositions and size distributions.
Journal ArticleDOI
A Model of the Brightness of Moonlight
TL;DR: In this article, measurements of the sky brightness from the 2800m level of Mauna Kea are reported, and a model is presented for predicting the moonlight as a function of the moon's phase, the zenith distance of the Moon, the Zenith Distance of the Sky Position, the angular separation of theMoon and sky position, and the local extinction coefficient.
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A photometric unit for the airglow and aurora
TL;DR: In this paper, the angular surface brightness B of these sources was measured in units of 106 quanta/cm2 sec sterad, and the advantages of this convention were pointed out and typical values of 4πB for night and twilight airglow and the aurora were given.
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