Variation Of Coronal Magnetic Field And Solar Flare Eruption

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Variation of Coronal Magnetic Field and Solar Flare Eruption

Author : Han He
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)

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Book Synopsis Variation of Coronal Magnetic Field and Solar Flare Eruption by : Han He

Download or read book Variation of Coronal Magnetic Field and Solar Flare Eruption written by Han He and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar flares are prominent eruptive phenomenon happening in the solar atmosphere. Major flares usually come from solar active regions (ARs) where strong and concentrated bipolar magnetic field exists and manifests as dark sunspots in photosphere. The photospheric magnetic field acts as the bottom boundary of corona system and confines the magnetic structure of the corona. For complex ARs, the coronal magnetic field generally contains electric current around the magnetic polarity inversion lines, which corresponds to the nonpotential magnetic field and manifests as twisted field lines. The coronal magnetic field structure evolves as the response to the variations of the photospheric magnetic field. This coronal evolution can be quasi-steady and approximated by the force-free condition. In some situations, the variations of photospheric magnetic field may cause sudden changes of topological structure of coronal magnetic field at certain sites in the corona. The plasmas at these sites lost equilibrium and are ejected from their original positions. This process is accompanied with magnetic reconnection and leads to the release of magnetic energy in the corona. Part of the released magnetic energy is converted to the electromagnetic emission which manifests as sudden brightening across a broad range of electromagnetic wave spectrum, and hence the flare phenomenon is initiated.

Magnetic Flux Ropes: From the Sun to the Earth and Beyond

Author : Rui Liu
Publisher : Frontiers Media SA
ISBN 13 : 2889663361
Total Pages : 126 pages
Book Rating : 4.8/5 (896 download)

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Book Synopsis Magnetic Flux Ropes: From the Sun to the Earth and Beyond by : Rui Liu

Download or read book Magnetic Flux Ropes: From the Sun to the Earth and Beyond written by Rui Liu and published by Frontiers Media SA. This book was released on 2020-12-31 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.

Physics of Geomagnetic Phenomena

Author : S. Matsushita
Publisher : Elsevier
ISBN 13 : 1483222519
Total Pages : 644 pages
Book Rating : 4.4/5 (832 download)

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Book Synopsis Physics of Geomagnetic Phenomena by : S. Matsushita

Download or read book Physics of Geomagnetic Phenomena written by S. Matsushita and published by Elsevier. This book was released on 2016-06-03 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physics of Geomagnetic phenomena, Volume I covers the significant advances in geomagnetism and the penetrations into the generation of geomagnetic field phenomena. This volume is composed of three chapters. Chapter I deals briefly with the discovery and developments in geomagnetism, followed by discussions on some fundamental topics of the field, including the aurora and geomagnetic storms. This chapter also considers the instruments, geomagnetic stations, and the correlations between geomagnetic indices. Chapter II describes the magnetic properties of minerals and various processes of acquisition of remanent magnetization. This chapter also provides palaeomagnetic data for the direction and intensity of the geomagnetic field in ancient times. Chapter III explores geomagnetic variations caused by solar flares and eclipses. This book will prove useful to physicists, students in upper atmospheric and space topics, and scientists in allied fields with a background in geomagnetism.

Nanofluid Flow in Porous Media

Author : Mohsen Sheikholeslami Kandelousi
Publisher : BoD – Books on Demand
ISBN 13 : 1789238374
Total Pages : 246 pages
Book Rating : 4.7/5 (892 download)

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Book Synopsis Nanofluid Flow in Porous Media by : Mohsen Sheikholeslami Kandelousi

Download or read book Nanofluid Flow in Porous Media written by Mohsen Sheikholeslami Kandelousi and published by BoD – Books on Demand. This book was released on 2020-08-19 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of fluid flow and heat transfer in a porous medium have been the subject of continuous interest for the past several decades because of the wide range of applications, such as geothermal systems, drying technologies, production of thermal isolators, control of pollutant spread in groundwater, insulation of buildings, solar power collectors, design of nuclear reactors, and compact heat exchangers, etc. There are several models for simulating porous media such as the Darcy model, Non-Darcy model, and non-equilibrium model. In porous media applications, such as the environmental impact of buried nuclear heat-generating waste, chemical reactors, thermal energy transport/storage systems, the cooling of electronic devices, etc., a temperature discrepancy between the solid matrix and the saturating fluid has been observed and recognized.

Evolution of 3-d Magnetic Topology in Flare-productive Active Regions

Author : Yixuan Li
Publisher :
ISBN 13 :
Total Pages : 127 pages
Book Rating : 4.:/5 (933 download)

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Book Synopsis Evolution of 3-d Magnetic Topology in Flare-productive Active Regions by : Yixuan Li

Download or read book Evolution of 3-d Magnetic Topology in Flare-productive Active Regions written by Yixuan Li and published by . This book was released on 2012 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar eruptive phenomena, such as flares and coronal mass ejections (CMEs), derive their energy from complex magnetic fields and are the principal source of disturbances that affect space weather. Although physical mechanism and dynamic morphology of flares have been a subject of intense research, many aspects of the flaring process still remain unclear. The objective of this dissertation is to advance the understanding of the physics behind solar flares based on observations, simulations and nonlinear force-free (NLFF) field modeling of magnetic fields. The data used in this study are obtained from several ground-based or space-borne instruments, including BBSO/DVMG, Hinode/SOT/SP, SDO/HMI and GOES. In addition, the advanced coronal modeling method was utilized to extrapolate NLFF magnetic fields. This dissertation focuses on the magnetic properties (magnetic inclination angle, transverse magnetic field, Lorentz force, etc.) and their evolution associated with flares. The observation is also compared with numerical MHD simulations and theoretical models. The main findings in this dissertation are briefly summarized as follows: (1) the white-light observation of S sunspots reveal the rapid penumbral decay and central umbral/penumbral darkening associated with flares; (2) the magnetic inclination angle shows an increase in the decayed peripheral penumbra and a decrease in the central area close to the flaring polarity inversion line (PIL) after major flares; (3) magnetic field observations indicate a rapid and permanent enhancement of the transverse magnetic field in the umbral core or inner penumbral region, while that in the outer decayed penumbral region decreases; (4) the downward Lorentz force exerted on the flaring area displays a sudden enhancement after flares; (5) the footpoint of flare ribbons shows slow shearing followed by fast diverging and deshearing motion. The remote Ha brightenings appear in the first stage of the eruption while the associated hard X-ray emission occurs in the later phase. These results provide strong evidence favoring superimposed effects of both the tether-cutting model, in which a short and flat loop forms near the photosphere after the eruption, and the back reaction of the coronal magnetic field following the energy release. The major contribution of this dissertation is: (1) First study of 3-D magnetic field change associated with flares in the perspective of magnetic inclination angle and transverse magnetic field; (2) First successful comparison of the numerical simulation, observation and theory of solar flare associated magnetic field changes; (3) First clear evidence of the two stage magnetic reconnection (implosion and explosion); (4) First evidence in support of the conservation of momentum in solar flare. To understand the radio emission produced by electrons at the very acceleration site of a solar flare, two competing acceleration models-stochastic acceleration by cascading MHD turbulence and regular acceleration in collapsing magnetic traps were studied. It is found that the radio emission from the acceleration sites (1) has sufficiently strong intensity to be observed by currently available radio instruments and (2) has spectra and light curves which are distinctly different in these two competing models, which makes them observationally distinguishable.

Physics of the Solar Corona

Author : Constantin J. Macris
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (144 download)

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Book Synopsis Physics of the Solar Corona by : Constantin J. Macris

Download or read book Physics of the Solar Corona written by Constantin J. Macris and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Solar Dynamics Observatory

Author : Phillip Chamberlin
Publisher : Springer Science & Business Media
ISBN 13 : 1461436737
Total Pages : 405 pages
Book Rating : 4.4/5 (614 download)

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Book Synopsis The Solar Dynamics Observatory by : Phillip Chamberlin

Download or read book The Solar Dynamics Observatory written by Phillip Chamberlin and published by Springer Science & Business Media. This book was released on 2012-05-05 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Solar and Space Physics

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309313953
Total Pages : 37 pages
Book Rating : 4.3/5 (93 download)

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Book Synopsis Solar and Space Physics by : National Research Council

Download or read book Solar and Space Physics written by National Research Council and published by National Academies Press. This book was released on 2014-09-25 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2010, NASA and the National Science Foundation asked the National Research Council to assemble a committee of experts to develop an integrated national strategy that would guide agency investments in solar and space physics for the years 2013-2022. That strategy, the result of nearly 2 years of effort by the survey committee, which worked with more than 100 scientists and engineers on eight supporting study panels, is presented in the 2013 publication, Solar and Space Physics: A Science for a Technological Society. This booklet, designed to be accessible to a broader audience of policymakers and the interested public, summarizes the content of that report.

Earth-affecting Solar Transients

Author : Jie Zhang
Publisher : Springer
ISBN 13 : 9789402415698
Total Pages : 744 pages
Book Rating : 4.4/5 (156 download)

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Book Synopsis Earth-affecting Solar Transients by : Jie Zhang

Download or read book Earth-affecting Solar Transients written by Jie Zhang and published by Springer. This book was released on 2018-10-27 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth-affecting solar transients encompass a broad range of phenomena, including major solar flares, CMEs, ICMEs, solar energetic particle events, and corotating interaction regions. In the past decade, nearly continuous observations of the Sun and the inner heliosphere with an unprecedented wide spatial coverage from a fleet of spacecraft, including STEREO Ahead/Behind, SDO, SOHO, Messenger, Venus Express, ACE and WIND, in combination with a significant advancement of global MHD numerical simulation and theoretical analysis, have greatly improved our understanding of solar transients and the prediction of their potential impact on Earth. This Topical Collection is based on the International Study of Earth-affecting Solar Transients (ISEST) project, initially launched in 2013 to bring together scientists from many countries to join efforts on studying solar transients. ISEST became one of the four research projects of the Variability of the Sun and Its Terrestrial Impact (VarSITI) program, sponsored by the Scientific Committee on Solar-Terrestrial Physics (SCOSTEP) for the period of 2014 – 2018. Originally published in the journal Solar Physics, volumes 292 (2017) and 293 (2018).

Sun, Earth and Sky

Author : Kenneth R. Lang
Publisher : Springer
ISBN 13 : 3642578527
Total Pages : 295 pages
Book Rating : 4.6/5 (425 download)

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Book Synopsis Sun, Earth and Sky by : Kenneth R. Lang

Download or read book Sun, Earth and Sky written by Kenneth R. Lang and published by Springer. This book was released on 2012-12-06 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: FROM THE REVIEWS "An excellent guide to present-day studies of the Sun and our stars impact on Earths space environmentcolorful (and useful) images and a thoughtful organization.A great read, written with enthusiasm and knowledge. " "An excellent guidea serious yet broadly accessible account of what science has learned about the Sun to date. With quotes from songs and poems, pictures ranging from impressionistic paintings to state-of-the-art photographs to computer graphics, this book is a delight."

Physics of the Solar Corona

Author : Markus Aschwanden
Publisher : Springer Science & Business Media
ISBN 13 : 9783540307655
Total Pages : 946 pages
Book Rating : 4.3/5 (76 download)

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Book Synopsis Physics of the Solar Corona by : Markus Aschwanden

Download or read book Physics of the Solar Corona written by Markus Aschwanden and published by Springer Science & Business Media. This book was released on 2006-01-30 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

The Sun as a Guide to Stellar Physics

Author : Oddbjørn Engvold
Publisher : Elsevier
ISBN 13 : 0128143355
Total Pages : 522 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis The Sun as a Guide to Stellar Physics by : Oddbjørn Engvold

Download or read book The Sun as a Guide to Stellar Physics written by Oddbjørn Engvold and published by Elsevier. This book was released on 2018-11-15 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Sun as a Guide to Stellar Physics illustrates the significance of the Sun in understanding stars through an examination of the discoveries and insights gained from solar physics research. Ranging from theories to modeling and from numerical simulations to instrumentation and data processing, the book provides an overview of what we currently understand and how the Sun can be a model for gaining further knowledge about stellar physics. Providing both updates on recent developments in solar physics and applications to stellar physics, this book strengthens the solar–stellar connection and summarizes what we know about the Sun for the stellar, space, and geophysics communities. Applies observations, theoretical understanding, modeling capabilities and physical processes first revealed by the sun to the study of stellar physics Illustrates how studies of Proxima Solaris have led to progress in space science, stellar physics and related fields Uses characteristics of solar phenomena as a guide for understanding the physics of stars

Solar Prominences

Author : Jean-Claude Vial
Publisher : Springer
ISBN 13 : 3319104160
Total Pages : 490 pages
Book Rating : 4.3/5 (191 download)

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Book Synopsis Solar Prominences by : Jean-Claude Vial

Download or read book Solar Prominences written by Jean-Claude Vial and published by Springer. This book was released on 2014-11-24 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the latest research results on solar prominences, including new developments on e.g. chirality, fine structure, magnetism, diagnostic tools and relevant solar plasma physics. In 1875 solar prominences, as seen out of the solar limb, were described by P.A. Secchi in his book Le Soleil as "gigantic pink or peach-flower coloured flames". The development of spectroscopy, coronagraphy and polarimetry brought tremendous observational advances in the twentieth century. The authors present and discuss exciting new challenges (resulting from observations made by space and ground-based telescopes in the 1990s and the first decade of the 21st century) concerning the diagnostics of prominences, their formation, their life time and their eruption along with their impact in the heliosphere (including the Earth). The book starts with a general introduction of the prominence “object” with some historical background on observations and instrumentation. In the next chapter, the various forms of prominences are described with a thorough attempt of classification. Their thermodynamic (and velocity) properties are then derived with emphasis on the methods (and their limits) used. This goes from the simplest optically thin case to the heavy radiative treatment of plasmas out of local thermodynamic equilibrium. The following chapters are devoted to the magnetic field measurements and indirect derivation. A new branch of diagnostic tools, the seismology, is presented along with some MHD basics. This allows to better understand the propagation of waves, the energy and force equilibria. Both small-scale and large-scale studies and their relationship are presented. The importance of the newly discovered cavities is stressed in the context of prominence destabilization. The issues of prominence formation and eruption, their connection with flares and Coronal Mass Ejections and their impact on the Earth are addressed on the basis of the latest results. Finally, an exciting new area of research is unveiled with the newly discovered evidence of similar manifestations in the Universe and their possible impact on the habitability of exoplanets. References to the basic physics (where necessary) are provided and the proposed web sites addresses will allow the reader to load exciting movies. The book is aimed at advanced students in astrophysics, post-graduates, solar physicists and more generally astrophysicists. Amateurs will enjoy the many new images which go with the text.

Handbook of Cosmic Hazards and Planetary Defense

Author : Joseph N. Pelton
Publisher : Springer
ISBN 13 : 9783319039510
Total Pages : 0 pages
Book Rating : 4.0/5 (395 download)

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Book Synopsis Handbook of Cosmic Hazards and Planetary Defense by : Joseph N. Pelton

Download or read book Handbook of Cosmic Hazards and Planetary Defense written by Joseph N. Pelton and published by Springer. This book was released on 2015-04-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers in a comprehensive fashion all aspects of cosmic hazards and possible strategies for contending with these threats through a comprehensive planetary defense strategy. This handbook brings together in a single reference work a rich blend of information about the various types of cosmic threats that are posed to human civilization by asteroids, comets, bolides, meteors, solar flares and coronal mass ejections, cosmic radiation and other types of threats that are only recently beginning to be understood and studied, such as investigation of the “cracks” in the protective shield provided by the Van Allen belts and the geomagnetosphere, of matter-antimatter collisions, orbital debris and radiological or biological contamination. Some areas that are addressed involve areas about which there is a good deal of information that has been collected for many decades by multiple space missions run by many different space agencies, observatories and scientific researchers. Other areas involving research and studies that have only recently gotten underway are discussed by some of the world’s foremost experts in each of these areas, who provide up-to-date and scientifically verifiable information. Although much of the work in these various areas have been conducted by space agencies, an expanding range of work is also being carried out by observatories, by universities and other research centers, and even by private foundations and professional organizations. The purpose of this work is thus several-fold: to include the latest information and most systematic research from around the world in a single reference work; to note where there are significant gaps in knowledge where new research, spacecraft, observatories, or other initiatives are needed to fill in critical missing information; and to give the best possible information about preventative actions that might be taken against cosmic threats and identify various alternative strategies that are now under way or planned to cope with these various threats.

Extreme Events in Geospace

Author : Natalia Buzulukova
Publisher : Elsevier
ISBN 13 : 0128127015
Total Pages : 798 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Extreme Events in Geospace by : Natalia Buzulukova

Download or read book Extreme Events in Geospace written by Natalia Buzulukova and published by Elsevier. This book was released on 2017-12-01 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extreme Events in Geospace: Origins, Predictability, and Consequences helps deepen the understanding, description, and forecasting of the complex and inter-related phenomena of extreme space weather events. Composed of chapters written by representatives from many different institutions and fields of space research, the book offers discussions ranging from definitions and historical knowledge to operational issues and methods of analysis. Given that extremes in ionizing radiation, ionospheric irregularities, and geomagnetically induced currents may have the potential to disrupt our technologies or pose danger to human health, it is increasingly important to synthesize the information available on not only those consequences but also the origins and predictability of such events. Extreme Events in Geospace: Origins, Predictability, and Consequences is a valuable source for providing the latest research for geophysicists and space weather scientists, as well as industries impacted by space weather events, including GNSS satellites and radio communication, power grids, aviation, and human spaceflight. The list of first/second authors includes M. Hapgood, N. Gopalswamy, K.D. Leka, G. Barnes, Yu. Yermolaev, P. Riley, S. Sharma, G. Lakhina, B. Tsurutani, C. Ngwira, A. Pulkkinen, J. Love, P. Bedrosian, N. Buzulukova, M. Sitnov, W. Denig, M. Panasyuk, R. Hajra, D. Ferguson, S. Lai, L. Narici, K. Tobiska, G. Gapirov, A. Mannucci, T. Fuller-Rowell, X. Yue, G. Crowley, R. Redmon, V. Airapetian, D. Boteler, M. MacAlester, S. Worman, D. Neudegg, and M. Ishii. Helps to define extremes in space weather and describes existing methods of analysis Discusses current scientific understanding of these events and outlines future challenges Considers the ways in which space weather may affect daily life Demonstrates deep connections between astrophysics, heliophysics, and space weather applications, including a discussion of extreme space weather events from the past Examines national and space policy issues concerning space weather in Australia, Canada, Japan, the United Kingdom, and the United States

Solar Energetic Particles

Author : Donald V. Reames
Publisher : Springer
ISBN 13 : 3319508717
Total Pages : 136 pages
Book Rating : 4.3/5 (195 download)

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Book Synopsis Solar Energetic Particles by : Donald V. Reames

Download or read book Solar Energetic Particles written by Donald V. Reames and published by Springer. This book was released on 2017-03-10 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This concise primer introduces the non-specialist reader to the physics of solar energetic particles (SEP) and systematically reviews the evidence for the two main mechanisms which lead to the so-called impulsive and gradual SEP events. More specifically, the timing of the onsets, the longitude distributions, the high-energy spectral shapes, the correlations with other solar phenomena (e.g. coronal mass ejections), as well as the all-important elemental and isotopic abundances of SEPs are investigated. Impulsive SEP events are related to magnetic reconnection in solar flares and jets. The concept of shock acceleration by scattering on self-amplified Alfvén waves is introduced, as is the evidence of reacceleration of impulsive-SEP material in the seed population accessed by the shocks in gradual events. The text then develops processes of transport of ions out to an observer. Finally, a new technique to determine the source plasma temperature in both impulsive and gradual events is demonstrated. Last but not least the role of SEP events as a radiation hazard in space is mentioned and a short discussion of the nature of the main particle telescope designs that have contributed to most of the SEP measurements is given.

An Introduction to Space Weather

Author : Mark Moldwin
Publisher : Cambridge University Press
ISBN 13 : 1108791719
Total Pages : 225 pages
Book Rating : 4.1/5 (87 download)

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Book Synopsis An Introduction to Space Weather by : Mark Moldwin

Download or read book An Introduction to Space Weather written by Mark Moldwin and published by Cambridge University Press. This book was released on 2022-11-30 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: This updated introductory textbook, with added learning features, explains how the Sun influences the Earth and its near-space environment.