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Author: Roger A. Morrison (CAPT, USAF.)
Publisher:
ISBN:
Category : Solar granulation
Languages : en
Pages : 154
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Book Description
Author: Roger A. Morrison (CAPT, USAF.)
Publisher:
ISBN:
Category : Solar granulation
Languages : en
Pages : 154
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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:
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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.
Author:
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ISBN:
Category : Chemistry
Languages : en
Pages : 544
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Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 186
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Book Description
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: Eugene F. Milone
Publisher: Springer Science & Business Media
ISBN: 1461488486
Category : Science
Languages : en
Pages : 348
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Book Description
The second edition of Solar System Astrophysics: Background Science and the Inner Solar System provides new insights into the burgeoning field of planetary astronomy. As in the first edition, this volume begins with a rigorous treatment of coordinate frames, basic positional astronomy, and the celestial mechanics of two and restricted three body system problems. Perturbations are treated in the same way, with clear step-by-step derivations. Then the Earth's gravitational potential field and the Earth-Moon system are discussed, and the exposition turns to radiation properties with a chapter on the Sun. The exposition of the physical properties of the Moon and the terrestrial planets are greatly expanded, with much new information highlighted on the Moon, Mercury, Venus, and Mars. All of the material is presented within a framework of historical importance. This book and its sister volume, Solar System Astrophysics: Background Science and the Inner Solar system, are pedagogically well written, providing clearly illustrated explanations, for example, of such topics as the numerical integration of the Adams-Williamson equation, the equations of state in planetary interiors and atmospheres, Maxwell’s equations as applied to planetary ionospheres and magnetospheres, and the physics and chemistry of the Habitable Zone in planetary systems. Together, the volumes form a comprehensive text for any university course that aims to deal with all aspects of solar and extra-solar planetary systems. They will appeal separately to the intellectually curious who would like to know how just how far our knowledge of the solar system has progressed in recent years.
Author: Marc Pinsonneault
Publisher: Cambridge University Press
ISBN: 1108835813
Category : Science
Languages : en
Pages : 337
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Book Description
A clear overview of stellar structure and stellar evolution for advanced students, incorporating modern observational advances.
Author: A. Krüger
Publisher: Springer Science & Business Media
ISBN: 9400994028
Category : Science
Languages : en
Pages : 346
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Book Description
1. 1. Short History of Solar Radio Astronomy Since its birth in the forties of our century, solar radio astronomy has grown into an extensive scientific branch comprising a number of quite different topics covering technical sciences, astrophysics, plasma physics, solar-terrestrial physics, and other disciplines. Historically, the story of radio astronomy goes back to the times of James Clerk Maxwell, whose well known phenomenological electromagnetic field equations have become the basis of present-time radio physics. As a direct consequence of these equations, Maxwell was able to prognosticate the existence of radio waves which fifteen years later were experimentally detected by the famous work of Heinrich Hertz (1887/88). However, all attempts to detect radio waves from cosmic objects failed until 1932, which was mainly due to the early stage of development of receiving techniques and the as yet missing knowledge of the existence of a screening ionosphere (which was detected in 1925). Therefore, famous inventors like Thomas Edison and A. E. Kennelly, as well as Sir Oliver Lodge, were unsuccessful in receiving any radio emission from the Sun or other extraterrestrial sources. Another hindering point was that nobody could a priori expect that solar radio emission should have something to do with solar activity so that unfortunately by chance some experiments were carried out just at periods of low solar activity. This was also why Karl Guthe Jansky at the birth of radio astronomy detected galactic radio waves but no emission from the Sun.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 252
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Book Description
