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Author: R. J. Bray
Publisher: Cambridge University Press
ISBN: 9780521247146
Category : Science
Languages : en
Pages : 288
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Book Description
This book presents an overview of observational and theoretical knowledge of solar granulation. When examined with a sufficiently powerful telescope the surface of the Sun reveals an irregular, cellular pattern of polygonal bright elements - granules - separated by narrow dark lanes. The application of high-resolution observing techniques (both from the ground and from high-altitude balloons) has given us a detailed picture of the properties and mode of origin of the granulation. The granulation is basically a convective phenomenon, each granule and its surrounding dark material representing a single convection cell. A useful feature of this volume is an extended discussion of the theory of convection, emphasizing astrophysical convection but including where relevant the theory and results of laboratory experiments. The observational and theoretical advances described in this book are a testament to the transformation of this branch of stellar physics. The authors take pains to make this complex branch of fluid dynamics accessible to the non-specialist.
Author: R. J. Bray
Publisher: Cambridge University Press
ISBN: 9780521247146
Category : Science
Languages : en
Pages : 288
Get Book Here
Book Description
This book presents an overview of observational and theoretical knowledge of solar granulation. When examined with a sufficiently powerful telescope the surface of the Sun reveals an irregular, cellular pattern of polygonal bright elements - granules - separated by narrow dark lanes. The application of high-resolution observing techniques (both from the ground and from high-altitude balloons) has given us a detailed picture of the properties and mode of origin of the granulation. The granulation is basically a convective phenomenon, each granule and its surrounding dark material representing a single convection cell. A useful feature of this volume is an extended discussion of the theory of convection, emphasizing astrophysical convection but including where relevant the theory and results of laboratory experiments. The observational and theoretical advances described in this book are a testament to the transformation of this branch of stellar physics. The authors take pains to make this complex branch of fluid dynamics accessible to the non-specialist.
Author: R. J. Bray
Publisher:
ISBN:
Category : Solar granulation
Languages : en
Pages : 188
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Book Description
Author: Bray
Publisher:
ISBN: 9780470099506
Category :
Languages : en
Pages : 150
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Book Description
Author: R. J. Rutten
Publisher: Springer Science & Business Media
ISBN: 940090911X
Category : Science
Languages : en
Pages : 638
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Book Description
Robert J. Rutten Sterrekundig Instituut Utrecht, The Netherlands Why this workshop? Why this workshop? Or rather, since the real question that arose about a year ago was not whether there should be another OAC workshop, but only what it should be about: why a workshop on granulation? To answer this question I will play an unfair trick on you. I will simply present the scientific justification which I included last autumn in a grant application to NATO's Scientific Affairs Division. It lists the reasons why I thought a workshop on this particular topic and at this particular moment ought to be worthwhile. There must be something in its reasoning, because NATO has indeed agreed to co-sponsor this workshop, and because all of you have decided to spend time and effort on your contributions and to journey to this beautiful island in order to participate. But since the proof is in the pudding, I am eager to see whether indeed this workshop will be as outstanding as I have promised; in the meantime, you are entitled to know what we got you here for. The justification went as follows: "The subject 'granulation' has recently become a hot topic, at the center of much new research, observational as well as interpretational and theoretical, and both in solar physics and in stellar physics.
Author: Roger A. Morrison (CAPT, USAF.)
Publisher:
ISBN:
Category : Solar granulation
Languages : en
Pages : 154
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Book Description
Author: J. B. Zirker
Publisher: JHU Press
ISBN: 9780801874192
Category : Science
Languages : en
Pages : 302
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Book Description
One of the most recent and exciting branches of astronomy, helioseismology—like its terrestrial counterpart—studies why the surface of the sun vibrates like a bell. Over the past three decades astronomers have gained spectacular insights into the structure and composition of the sun's interior, transforming the way we understand stellar matter. In Sunquakes, Jack B. Zirker tells the story of this new science and explains the physics behind these illuminating vibrations. Zirker recounts the discovery of solar oscillations in the early 1960s and international efforts throughout the rest of the decade to explain this phenomenon. By the mid-1970s, scientists working independently in France, Germany, Japan, and the U.S. had developed a new theoretical model of the sun that postulated the existence of trapped sound and gravity waves as the cause for the roiling of the sun's surface. Using solar oscillation data, scientists derived for the first time the thermal and dynamic properties of the solar interior and revealed its complicated rotation patterns; even such astronomical mysteries as the deficit of solar neutrinos were solved. Describing the competition and cooperation between astronomers, particle physicists, and other theorists to the technological innovations that makes solar observation more and more precise, Sunquakes provides professionals and nonscientists alike with an absorbing and accessible guide to the field of helioseismology. The book concludes with an account of recent efforts to probe the interiors of stars far beyond our own solar system.
Author: Andrew Skumanich
Publisher:
ISBN:
Category : Sun
Languages : en
Pages : 36
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Book Description
Author: Blake F. Kinahan
Publisher:
ISBN:
Category : Spectrum, Solar
Languages : en
Pages : 80
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Book Description
Author: Roger A. Morrison
Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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Book Description
Three filtergrams of the solar granulation taken in the light of the Fe 6569 A line at various positions on the solar disk were analyzed in an attempt to detect and measure the Doppler velocities due to horizontal and vortex motions. The results establish the existence of a horizontal outflow, but the vortex motions across a statistical granule was calculated and ranged from zero at granule center to three at 600 km from granule center.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
The Solar Optical Universal Polarimeter (SOUP) on Spacelab 2 collected movies of solar granulation completely free from the distortion and blurring introduced by the Earth's atmosphere. Individual images in the movies are diffraction-limited (30 cm aperture) and are not degraded by pointing jitter. The movies illustrate that the solar 5 minute oscillation has a major role in the appearance of solar granulation and that exploding granules are a common feature of the granule evolution. Using three-dimensional Fourier filtering techniques, we have been able to remove the oscillations and demonstrate that they dominate the temporal autocorrelation functions of the granulation pattern. When the oscillations are removed, the autocorrelation lifetime of granulation is a factor of 2 greater in magnetic field regions than in field-free quiet Sun. Using a technique called local correlation tracking, we have been able to measure horizontal velocities and observe flow patterns on the scale of meso- and supergranulation. In quiet regions the mean flow velocity is 370 m/s, while in magnetic regions it is about 125 m/s. We have also found that the root mean square fluctuating horizontal velocity field in quiet Sun increases from 0.45 to 1.4 km/s, and in strong magnetic field regions it increases from 0.3 to 0.75 km/s as the measuring aperture decreases.
