Download or read book Determining the Temperature Structure of Solar Coronal Loops Using Their Temporal Evolution written by Fana Mariam Mulu-Moore and published by . This book was released on 2009 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catastrophic Cooling in Solar Coronal Loops written by Daniel Müller and published by Cuvillier Verlag. This book was released on 2004 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigating Our Dynamic Solar Corona from Near Sun to 1 Au written by Jaz Pearson and published by LAP Lambert Academic Publishing. This book was released on 2012-06 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis explores two area of high interest in the field of solar physics: the propagation of CMEs; and the heating and thermal evolution of coronal loops. In the study of coronal mas ejections, the NASA satellite STEREO is used to observe CMEs as they propagate through the heliosphere and into interplanetary space. Two separate techniques are employed to derive the three-dimensional position angles and kinematic profiles of three separate CME events. The study of coronal loops consists of two parts: hydrodynamics and hydrostatics. A 1-D hydrodynamic Lagrange re-map code is employed to numerically model a coronal loop split into many sub-resolution strands. Each strand is heated impulsively, by localised energy bursts, and the strands are then amalgamated to form a global loop system. A phase plane analysis is introduced to study the temperature structure along 1-D hydrostatic coronal loops, using a new four-range optically thin radiative loss function, to analytically solve the thermal equilibrium equation and investigate the resulting solution space.
Download or read book Multi Wavelength Observations of Coronal Structure and Dynamics written by Penny Martens and published by Elsevier. This book was released on 2002-10-21 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: These are the Proceedings of the Yohkoh 10th Anniversary Meeting, a COSPAR Colloquium held in Kona, Hawaii, USA, on January 20-24, 2002. The title of the meeting was Multi-Wavelength Observations of Coronal Structure and Dynamics. In these proceedings the many and varied advances of the dynamics solar atmosphere in the past ten years of observations by Yohkoh have been reviewed.
Download or read book Coronal Holes and Solar Wind Acceleration written by John L. Kohl and published by Springer Science & Business Media. This book was released on 2013-11-09 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The SOHO-7 Workshop was held from 28 September through 1 October 1998 at the Asticou Inn in Northeast Harbor, Maine. The primary topic of this Workshop was the impact of SOHO observations on our understanding of the nature and evolution of coronal holes and the acceleration and composition of the solar wind. The presentations and discussions occasionally went beyond this topic to include the impact of the reported research on other solar structures and the heliosphere. SOHO (the Solar and Heliospheric Observatory), a project of international cooperation between ESA and NASA, was launched in December 1995 and began its science operations during the first few months of 1996. To many solar and space physicists, it was a great advantage that SOHO began itscomprehensive look at the Sun during the 1996 solar minimum. The qualitatively simple two-phase corona, with polar coronal holes expanding into the high-speed solar wind, and a steady equatorial streamer belt related somehow to the stochastic slow-speed solar wind, allowed various SOHO diagnostics to be initiated with a reasonably well understoodcircumsolar geometry. The analysis of subsequentSOHO measurements made during the rising phase of solar cycle 23 will continue to benefit from what has been learned from the first two years of data.
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 524 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
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 2004-09 with total page 888 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.
Download or read book Coronal Streamers Coronal Loops and Coronal and Solar Wind Composition written by C. Mattok and published by . This book was released on 1992 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phenomena in the Solar Corona written by Caroline Alexander and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a study of multiple phenomena that exist within the solar corona. The structures explored in this work cover a range of sizes from a small-scale X-ray bright point (10 Mm), to medium-scale coronal loops(10-100 Mm), and finally to a large-scale prominence (100 Mm). Observational data and numerical simulations were utilised in order to investigate the structure and evolution of each type of feature. A small-scale X-ray bright point (XBP) was investigated using complete Hinode observations in order to examine it over its entire lifetime (∼12 hours). The XBP was found to be formed directly above an area of cancelling magnetic flux on the photosphere. A good correlation between the rate of X-ray emission and decrease in total magnetic flux was found. The magnetic fragments of the XBP were found to vary on very short timescales (minutes), however the global quasi-bipolar structure remained throughout the lifetime of the XBP. Electron density measurements were obtained using a line ratio of Fe XII and the average density was found to be 5±1x109 cm−3 with the volumetric plasma filling factor calculated to have an average value of 0.04±15%. Emission measure loci plots were then used to infer a steady temperature of log Te [K] ∼ 6.1±0.1. The calculated Fe XII Doppler shifts show velocity changes in and around the bright point of ±15 kms−1 which are observed to change on a timescale of less than 30 minutes. The results indicate that higher cadence spectroscopic measurements are required if the velocity flows are to be related to corresponding changes in the magnetic field. The next feature investigated was a 100 Mm multistranded coronal loop that was simulated in order to investigate how changing the various model parameters would affect the resulting differential emission measure DEM distributions and intensity values. Once the model was fully understood, it was used to test a DEM solver and quantify the 'goodness-of-fit' that could be achieved. This allowed the imitations of the DEM method to be understood. As the model parameter space was altered, a number of changes in the resulting synthetic DEMs were observed. In most cases these changes were subtle and could be explained by the changing physics of the system. The cooling simulation showed the most unique changes where the total energy of the system could be identified by examining the evolution of the intensity values and DEM shape. The iterative solver solution XRT DEM iterative2 did an excellent job of reconstructing the original model intensity values and DEM distributions in the majority of cases. The only instance where the solver did not do well was when the synthetic DEM was very narrow i.e., only covering a few temperature bins. This highlights the under-constrained problem of using DEM solvers and shows that this particular solver works best when the original DEM being reconstructed is smoother and more multithermal. Finally, a large-scale prominence eruption was investigated using observations from two points of view. The structure and evolution of the prominence material and cavity were examined over the eruption process. Many possible initiation methods were investigated to see if the cause of the prominence eruption could be pinned down. It was found that the polar-crown cavity could be defined as a density depletion sitting above denser polar-crown filament plasma which has drained down from the cavity due to gravity. The eruption of the polar crown cavity as a solid body can be decomposed into two phases: a slow rise at a speed of 2 ±0.2 km s−1 , and an acceleration phase at a mean speed of 15-25 ±0.6 km s−1 . The initiation of the prominence was concluded to be caused by a combination of mass un-loading and a type of kink instability.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solar Optical Telescope SOT written by United States. National Aeronautics and Space Administration and published by . This book was released on 1980 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Solar Terrestrial Magnetic Activity and Space Environment written by H. Wang and published by Elsevier. This book was released on 2002-11-20 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: The COSPAR Colloquium on Solar-Terrestrial Magnetic Activity and Space Environment (STMASE) was held in the National Astronomy Observatories of Chinese Academy of Sciences (NAOC) in Beijing, China in September 10-12, 2001. The meeting was focused on five areas of the solar-terrestrial magnetic activity and space environment studies, including study on solar surface magnetism; solar magnetic activity, dynamical response of the heliosphere; space weather prediction; and space environment exploration and monitoring. A hot topic of space research, CMEs, which are widely believed to be the most important phenomenon of the space environment, is discussed in many papers. Other papers show results of observational and theoretical studies toward better understanding of the complicated image of the magnetic coupling between the Sun and the Earth, although little is still known little its physical background. Space weather prediction, which is very important for a modern society expanding into out-space, is another hot topic of space research. However, a long way is still to go to predict exactly when and where a disaster will happen in the space. In that sense, there is much to do for space environment exploration and monitoring. The manuscripts submitted to this Monograph are divided into the following parts: (1) solar surface magnetism, (2) solar magnetic activity, (3) dynamical response of the heliosphere, (4) space environment exploration and monitoring; and (5) space weather prediction. Papers presented in this meeting but not submitted to this Monograph are listed by title as unpublished papers at the end of this book.
Download or read book Physics of the Inner Heliosphere II written by Rainer Schwenn and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physics of the Inner Heliosphere gives for the first time a comprehensive and complete summary of our knowledge of the inner solar system. Using data collected over more than 11 years by the HELIOS twin solar probes, one of the most successful ventures in unmanned space exploration, the authors have compiled six extensive reviews of the physical processes of the inner heliosphere and their relation to the solar atmosphere. Researchers and advanced students in space and plasma physics, astronomy, and solar physics will be surprised to see just how closely the heliosphere is tied to, and how sensitively it depends on, the sun. Volume 2 deals with particles, waves, and turbulence, with chapters on: - magnetic clouds - interplanetary clouds - the solar wind plasma and MHD turbulence - waves and instabilities - energetic particles in the inner solar system
Download or read book Kappa Distributions written by George Livadiotis and published by Elsevier. This book was released on 2017-04-19 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kappa Distributions: Theory and Applications in Plasmas presents the theoretical developments of kappa distributions, their applications in plasmas, and how they affect the underpinnings of our understanding of space and plasma physics, astrophysics, and statistical mechanics/thermodynamics. Separated into three major parts, the book covers theoretical methods, analytical methods in plasmas, and applications in space plasmas. The first part of the book focuses on basic aspects of the statistical theory of kappa distributions, beginning with their connection to the solid backgrounds of non-extensive statistical mechanics. The book then moves on to plasma physics, and is devoted to analytical methods related to kappa distributions on various basic plasma topics, spanning linear/nonlinear plasma waves, solitons, shockwaves, and dusty plasmas. The final part of the book deals with applications in space plasmas, focusing on applications of theoretical and analytical developments in space plasmas from the heliosphere and beyond, in other astrophysical plasmas. Kappa Distributions is ideal for space, plasma, and statistical physicists; geophysicists, especially of the upper atmosphere; Earth and planetary scientists; and astrophysicists. - Answers important questions, such as how plasma waves are affected by kappa distributions and how solar wind, magnetospheres, and other geophysical, space, and astrophysical plasmas can be modeled using kappa distributions - Presents the features of kappa distributions in the context of plasmas, including how kappa indices, temperatures, and densities vary among the species populations in different plasmas - Provides readers with the information they need to decide which specific formula of kappa distribution should be used for a certain occasion and system (toolbox)
Download or read book The Sun in Time written by Charles Philip Sonett and published by University of Arizona Press. This book was released on 1991 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt: An interdisciplinary approach to solar physics, as eighty-nine contributors trace the evolution of the Sun and provide a review of our current understanding of both its structure and its role in the origin and evolution of the solar system.
Download or read book Basic Plasma Processes on the Sun written by E.R. Priest and published by Springer Science & Business Media. This book was released on 1990-09-30 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Much of the excitement in modern Solar Physics has come from the realisation that the Sun is a plasma and that this plasma is interacting with the magnetic field in a wide variety of subtle ways. As well as being of great interest in their own right the observed plasma phenomena on the Sun are of much wider importance, since they reveal to us details of basic phenomena that are expected to be occurring throughout the universe. It was with this in mind that 173 solar physicists from 17 countries gathered together in Bangalore with an air of anticipation. We were not disappointed as we received the warmest of welcomes from our graceful and charming host,Vinod Krishan. She and her colleagues worked tirelessly to make our stay a most memorable one and to ensure that the meeting ran with calm and efficiency. In addition to being stimulated by an excellent series of talks on the up-to-the minute advances in our subject, it was a pleasure to make new friendships from so many countries and to learn, in particular, of the Solar Physics being done in India which has a great tradition and is of a high standard. Furthermore, we enjoyed hearing about Indian culture and appreciating its beauty, especially on our day's tour into the countryside to visit some Hindu and Jain temples.
