Statistical Properties of Solar Granulation Derived from the Soup Instrument on Spacelab 2 PDF Download
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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:
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.
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: Jan Olof Stenflo
Publisher: Springer Science & Business Media
ISBN: 9400910614
Category : Science
Languages : en
Pages : 546
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Book Description
Solar and stellar photospheres constitute the layers most accessible to observations, forming the interface between the interior and the outside of the stars. The solar atmosphere is a rich physics laboratory, in which the whole spectrum of radiative, dynamical, and magnetic processes that tranfer energy into space can be observed. As the fundamental processes take place on very small spatial scales, we need high· resolution observations to explore them. On the other hand the small-scale processes act together to form global properties of the sun, which have their origins in the solar interior. The rapid advances in observational techniques and theoreticallllodelling over the past decade made it very timely to bring together scientists from east and west to the first lAU Symposium on this topic. The physics of the photosphere involves complicated interactions between magnetic fields, convection, waves, and radiation. During the past decade our understanding of these gener ally small-scale structures and processes has been dramatically advanced. New instrumen tations, on ground and in space, have given us new means to study the granular convection. Diagnostic methods in Stokes polarimetry have allowed us to go beyond the limitations of spatial resolution to explore the structure and dynamics of the subarcsec magnetic struc tures. Extensive numerical simulations of the interaction between convection and magnetic fields using powerful supercomputers are providing deepened physical insight. Granulation, magnetic fields, and dynamo processes are being explored in the photospheres of other stars, guided by our improved understanding of the solar photosphere.
Author: Dmitri Rabounski
Publisher: Infinite Study
ISBN:
Category :
Languages : en
Pages : 108
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Book Description
The Journal on Advanced Studies in Theoretical and Experimental Physics, including Related Themes from Mathematics
Author: Astronomisches Rechen-Institut
Publisher: Springer Science & Business Media
ISBN: 3662123703
Category : Science
Languages : en
Pages : 1433
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Book Description
From the reviews: "Astronomy and Astrophysics Abstracts has appeared in semi-annual volumes since 1969 and it has already become one of the fundemental publications in the fields of astronomy, astrophysics and neighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. ...The abstracts are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world." Space Science Review# "Dividing the whole field plus related subjects into 108 categories, each work is numbered and most are accompanied by brief abstracts. Fairly comprehensive cross-referencing links relevant papers to more than one category, and exhaustive author and subject indices are to be found at the back, making the catalogues easy to use. The series appears to be so complete in its coverage and always less than a year out of date that I shall certainly have to make a little more space on those shelves for future volumes." The Observatory Magazine#
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 984
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Book Description
Author: Peter A Fox
Publisher: CRC Press
ISBN: 1482282941
Category : Science
Languages : en
Pages : 392
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Book Description
Geophysical and Astrophysical Convection collects important papers from an international group of the world's foremost researchers in geophysical and astrophysical convection to present a concise overview of recent thinking in the field. Topics include: Atmospheric convection, solar and stellar convection, unsteady non-penetrative thermal convectio
Author: Dermott J. Mullan
Publisher: CRC Press
ISBN: 1420083082
Category : Science
Languages : en
Pages : 384
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Book Description
With an emphasis on numerical modeling, Physics of the Sun: A First Course presents a quantitative examination of the physical structure of the Sun and the conditions of its extended atmosphere. It gives step-by-step instructions for calculating the numerical values of various physical quantities.The text covers a wide range of topics on the Sun an
Author:
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ISBN:
Category : Astronomy
Languages : en
Pages : 762
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Author: Toshifumi Shimizu
Publisher: Springer
ISBN: 9811077428
Category : Science
Languages : en
Pages : 309
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Book Description
This book provides the latest scientific understanding of the Sun, sharing insights gleaned from the international solar physics project Hinode. The authors (who are the main project contributors) review, from the various viewpoints, the discoveries and advances made by the on-orbit operations of the Hinode spacecraft in its first decade. Further, they present a wealth of scientifically important photographs and data from Hinode. Launched in September 2006, Hinode is the third Japanese solar observatory on orbit, and employs three highly advanced telescopes jointly developed and operated with international partners. The book describes the background of these research topics, how the Hinode telescopes have tackled various challenges, and the scientific achievements and impacts in the first 10 years. Furthermore, it explores future perspective of researches in Japan. The book will benefit undergraduate students interested in recent advance in the solar research, as well as graduate students and researchers working in solar physics, the space sciences, astronomy, and plasma physics.
