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Author: Philip Judge
Publisher: Springer
ISBN: 9783031462726
Category : Science
Languages : en
Pages : 0
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Book Description
This book reflects on 8 decades of research on one of the longest-standing unsolved problems in modern astrophysics: why does the Sun form a hot corona? The authors give a critical overview of the field and offer suggestions on how to bridge the chasm between what we can measure, and what we can calculate. They go back to basics to explain why the problem is difficult, where we have made progress and where we have not, to help the next generation of scientists devise novel techniques to crack such a long-lasting problem. A way forward is formulated centered around refutation, using Bayesian methods to propose and to try to reject hypotheses and models, and avoiding seduction by ``confirmation bias’’. This book is aimed at physicists, students and researchers interested in understanding, learning from and solving the coronal heating problem, in an era of new dedicated facilities such as the Parker Solar Probe and the Daniel K. Inouye Solar Telescope. The book will appeal to those interested in understanding research methods and how they are changing in the modern academic environment, particular in astrophysics and Earth sciences where remote sensing is essential.
Author: Philip Judge
Publisher: Springer
ISBN: 9783031462726
Category : Science
Languages : en
Pages : 0
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Book Description
This book reflects on 8 decades of research on one of the longest-standing unsolved problems in modern astrophysics: why does the Sun form a hot corona? The authors give a critical overview of the field and offer suggestions on how to bridge the chasm between what we can measure, and what we can calculate. They go back to basics to explain why the problem is difficult, where we have made progress and where we have not, to help the next generation of scientists devise novel techniques to crack such a long-lasting problem. A way forward is formulated centered around refutation, using Bayesian methods to propose and to try to reject hypotheses and models, and avoiding seduction by ``confirmation bias’’. This book is aimed at physicists, students and researchers interested in understanding, learning from and solving the coronal heating problem, in an era of new dedicated facilities such as the Parker Solar Probe and the Daniel K. Inouye Solar Telescope. The book will appeal to those interested in understanding research methods and how they are changing in the modern academic environment, particular in astrophysics and Earth sciences where remote sensing is essential.
Author: Markus Aschwanden
Publisher: Springer Science & Business Media
ISBN: 9783540307655
Category : Science
Languages : en
Pages : 946
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Book Description
A thorough introduction to solar physics based on recent spacecraft observations. The author introduces the solar corona and sets it in the context of basic plasma physics before moving on to discuss plasma instabilities and plasma heating processes. The latest results on coronal heating and radiation are presented. Spectacular phenomena such as solar flares and coronal mass ejections are described in detail, together with their potential effects on the Earth.
Author: Philip Judge
Publisher: Springer Nature
ISBN: 3031462734
Category :
Languages : en
Pages : 275
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Book Description
Author: Nour E. Raouafi
Publisher: John Wiley & Sons
ISBN: 1119507537
Category : Science
Languages : en
Pages : 323
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Book Description
A comprehensive view of our Sun at the start of a new era in solar and heliospheric physics Humans have been observing and studying our Sun for centuries, yet much is still unknown about the processes that drive its behavior. Thanks to a new generation of space missions and ground telescopes, we are poised to dramatically increase our understanding of the Sun and its environment. Solar Physics and Solar Wind explores advances in solar and heliospheric research over recent decades, as well as the challenges that remain. This comprehensive reference work covers the solar interior, magnetism and radiation, plasma heating and acceleration, the sun's atmosphere, and solar activity. Volume highlights include: Explanations for processes in the solar interior New insights on the solar wind The challenges of measuring the Sun's magnetic field and its radiative output Description of solar atmospheric phenomena such as spicules and jets New developments in understanding flares and coronal mass ejections Ongoing research into how the solar corona is heated The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals. Find out more about the Space Physics and Aeronomy collection in this Q&A with the Editors in Chief
Author: Boris V. Gudiksen
Publisher:
ISBN: 9789172657984
Category :
Languages : en
Pages : 44
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Book Description
Author: Phillip Chamberlin
Publisher: Springer Science & Business Media
ISBN: 1461436737
Category : Science
Languages : en
Pages : 405
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Book Description
This volume is dedicated to the Solar Dynamics Observatory (SDO), which was launched 11 February 2010. The articles focus on the spacecraft and its instruments: the Atmospheric Imaging Assembly (AIA), the Extreme Ultraviolet Variability Experiment (EVE), and the Helioseismic and Magnetic Imager (HMI). Articles within also describe calibration results and data processing pipelines that are critical to understanding the data and products, concluding with a description of the successful Education and Public Outreach activities. This book is geared towards anyone interested in using the unprecedented data from SDO, whether for fundamental heliophysics research, space weather modeling and forecasting, or educational purposes. Previously published in Solar Physics journal, Vol. 275/1-2, 2012. Selected articles in this book are published open access under a CC BY-NC 2.5 license at link.springer.com. For further details, please see the license information in the chapters.
Author: Vinod Kumar Joshi
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659141539
Category :
Languages : de
Pages : 188
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Book Description
The sun is a main sequence G2V star, based on Hertzsprung-Russel(H-R)diagram classification. Earlier studies have shown that the temperature of the core is about 15 MK and as we move away from the core, temperature decreases from 15 MK to 5800 K at photosphere. There is anomalous variation of temperature after photosphere, it starts increasing for further layers and there is abrupt change in temperature from transition region to corona. After the corona, temperature decreases again slowly. The temperature of the corona is found millions of kelvin higher than that of the surface temperature. This major unresolved fact in astrophysics is known as "solar coronal heating" problem. Several mechanisms of solar coronal heating have been discussed but none of the mechanisms is able to account for the extreme coronal temperature. This book is aimed towards the theoretical studies of solar coronal heating mechanisms by microflares and nanoflares. Here we have addressed the solution of solar coronal heating problem, using the phenomena of solar flares. Solar flares are the most interesting phenomena of the sun, which occur suddenly by releasing enormous amount of energy in a very short time.
Author: Eric Priest
Publisher: Cambridge University Press
ISBN: 0521854717
Category : Science
Languages : en
Pages : 581
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Book Description
This advanced textbook reviews the complex interaction between the Sun's plasma atmosphere and its magnetic field.
Author: Constantin J. Macris
Publisher:
ISBN:
Category : Sun
Languages : en
Pages : 0
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Book Description
Author: P. D. Smith
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
It has been known since the 1930s that the solar corona is hundreds of times hotter than the solar photosphere. Numerous theoretical models have since been proposed to explain what has become known as the coronal heating problem. These models are broadly cate- gorised as either wave heating (AC) or magnetic reconnection (DC). In this thesis aspects of both AC and DC heating models are investigated using analytical and numerical tech- niques. The dominant AC heating model, known as phase mixing, proposes that magnetic Alfven waves, generated at the photosphere, dissipate in the corona due to inhomoge- neous coronal structures. In this work corrected analytical solutions are presented for the enhanced phase mixing of linear Alfven waves in divergent and stratified coronal struc- tures. Numerical simulations are used to confirm the validity of these analytical solutions. Further numerical simulations investigate the magnitude and location of the wave dissi- pation. It is found that the enhanced phase mixing of 0.1 Hz Alfven waves can fulfil the coronal heating energy requirement. The DC heating models propose that eruptions of photospheric plasma, known as so- lar flares, are initiated by the reconnection of magnetic fields. These frequently observed flares release significant quantities of stored magnetic energy over a wide range of spa- tial scales, heating the surrounding plasma. In this work the magnetic reconnection of coalescing chromospheric current loops is investigated using two-fluid numerical simula- tions. It is found that the rate of the magnetic reconnection, and hence energy release, is strongly affected by the initial local plasma conditions. Finally, a model is proposed to explain the recently discovered penumbral micro-jets, based on the interaction of coalescing current loops with background magnetic flux tubes. Bidirectional jets and significant proton heating are observed in numerical simulations of the proposed model.
