Results 211 to 220 of about 4,658 (241)

Solar eclipse sky brightness and color

Applied Optics
The sky viewed by an observer at the center of a solar eclipse is not entirely dark but is instead dimly illuminated by light scattered from the atmosphere outside of the eclipse shadow. This process is dominated by second-order scattering, so the zenith totality sky is expected to be approximately four orders of magnitude ...
Joseph A. Shaw, Glenn E. Shaw, Bryan Scherrer, Laura Eshelman, Stephen Turcotte   +4 more
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Resistance to immunotherapy: clouds in a bright sky

Investigational New Drugs, 2017
Two major challenges persist for an optimal management of immunotherapy: i) identifying those patients who will benefit from this type of therapy, and ii) determining the biological, cellular and molecular mechanisms that trigger disease progression while on therapy.
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Spectral Brightness of the Sky

1970
Knowledge of the brightness distribution of the daytime clear sky for different values of the atmospheric parameters is necessary for solving a number of applied problems. In twilight studies, for example, in order to take into account the influence of the troposphere, the brightness of the daytime clear sky must be known in absolute units for a large ...
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The Brightness of the Night Sky

1998
So writes Jack Finney in Time and Again, his glorious and loving portrait of the New York City of 1882 as seen through the eyes of a late-twentieth-century time traveler. Even at that time, New York was a great metropolis of almost two million people, most living in Manhattan.
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THE BRIGHTNESS OF THE SKY IN THE VICINITY OF THE SUN

1963
Abstract : A study made of the scattering of small particles in the earth's atmosphere set a standard for studies of atmospheric pollution by dust, smoke, or other particles. The study takes into ac count the diffusion of particles from a source of pollution, such as an industrial chimney, and sets limits for the pollution in terms of sky brightness ...
H. K. Sen, D. H. Menzel
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Brightness oscillations of daytime sky

Nature, 1978
WE report here the discovery of sky brightness oscillations, observed during May 1976 and November 1977, which can be associated with atmospheric waves, perhaps on the aerosol boundary layer; this discovery also has a bearing on experiments now investigating solar diameter oscillations.
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Sky Brightness as a Function of Altitude

Applied Optics, 1964
It is shown that the preponderance of experimental evidence supports the theoretical prediction based on Rayleigh scattering for the variation of sky brightness with altitude. Curves indicating the limits of sky brightness as a function of altitude are given.
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Explanation of the Brightness and Color of the Sky, Particularly the Twilight Sky

Journal of the Optical Society of America, 1953
By use of the Rayleigh scattering theory for pure air, primary scattering and known upper air densities from rockets, the brightness of the zenith twilight sky was calculated and values were obtained two to four times greater than those observed at Sacramento Peak, New Mexico ( J. Opt. Soc. Am.42, 353 ( 1952).
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A Photometer for Measurement of Sky Brightness Near the Sun

Journal of the Optical Society of America, 1948
Measurement of the brightness of the sky near the sun is difficult because instrumental scattered light originating in the solar disk is usually many times brighter than light from the sky. An optical system for eliminating this scattered light and providing means for a visual photometric comparison between the sky and the sun has been constructed and ...
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The brightness of the zenith sky during twilight

Proceedings of the Indian Academy of Sciences - Section A, 1941
A visual photometer is described for measuring the brightness of the zenith sky during twilight. The results of measurements made with it at Bombay on a large number of clear moonless evenings during the period December 1937 to March 1938 are discussed. A red filter RG1 (Schott and Gen.) and a green filter VG1 (Schott and Gen.) were used.
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