Low-frequency Oscillations of the Solar Atmosphere
Author | : R. T. J. McAteer |
Publisher | : |
Total Pages | : |
Release | : 2004 |
Genre | : |
ISBN | : |
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Author | : R. T. J. McAteer |
Publisher | : |
Total Pages | : |
Release | : 2004 |
Genre | : |
ISBN | : |
Author | : International Astronomical Union. Symposium |
Publisher | : Cambridge University Press |
Total Pages | : 404 |
Release | : 2008-06-12 |
Genre | : Science |
ISBN | : 9780521874694 |
Provides the latest summary on the solar coronal heating enigma and magneto-seismology of the solar atmosphere, for solar physics researchers.
Author | : Andreas Keiling |
Publisher | : John Wiley & Sons |
Total Pages | : 524 |
Release | : 2016-04-04 |
Genre | : Science |
ISBN | : 1119054958 |
Low-frequency waves in space plasmas have been studied for several decades, and our knowledge gain has been incremental with several paradigm-changing leaps forward. In our solar system, such waves occur in the ionospheres and magnetospheres of planets, and around our Moon. They occur in the solar wind, and more recently, they have been confirmed in the Sun’s atmosphere as well. The goal of wave research is to understand their generation, their propagation, and their interaction with the surrounding plasma. Low-frequency Waves in Space Plasmas presents a concise and authoritative up-to-date look on where wave research stands: What have we learned in the last decade? What are unanswered questions? While in the past waves in different astrophysical plasmas have been largely treated in separate books, the unique feature of this monograph is that it covers waves in many plasma regions, including: Waves in geospace, including ionosphere and magnetosphere Waves in planetary magnetospheres Waves at the Moon Waves in the solar wind Waves in the solar atmosphere Because of the breadth of topics covered, this volume should appeal to a broad community of space scientists and students, and it should also be of interest to astronomers/astrophysicists who are studying space plasmas beyond our Solar System.
Author | : Frank Quimby Orrall |
Publisher | : |
Total Pages | : 16 |
Release | : 1966 |
Genre | : Solar atmosphere |
ISBN | : |
Author | : Bernhard Fleck |
Publisher | : Springer Science & Business Media |
Total Pages | : 536 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9400901917 |
SOHO, the Solar and Heliospheric Observatory, is a project of international cooperation between ESA and NASA to study the Sun, from its deep core to the outer corona, and the solar wind. To achieve its scientific goals it carries a complement of twelve sophisticated, state-of-the-art instruments. Three helioseismology instruments are expected to provide unique data for the study of the structure and dynamics of the solar interior, from the very deep core to the outermost layers of the convection zone. A set of five complementary remote sensing instruments, consisting of EUV and UV imagers, spectrographs and coronagraphs, will give us our first comprehensive view of the outer solar atmosphere and corona, leading to a better understanding of the enigmatic coronal heating and solar wind acceleration processes. Finally, three experiments will complement the remote sensing observations by making in-situ measurements of the composition and energy of the solar wind and charged energetic particles. This volume contains detailed descriptions of all the twelve instruments on board SOHO. Also included are an overview paper and a description of the SOHO ground system, science operations and data products. The aim of these papers is to make the broader scientific community, and in particular potential guest investigators, aware of the scientific objectives and capabilities of the SOHO payload and to provide a reference document for the various instruments.
Author | : Marie Elizabeth Newington |
Publisher | : |
Total Pages | : 207 |
Release | : 2013 |
Genre | : |
ISBN | : |
Estimates of wave energy fluxes in the solar photosphere and chromosphere suggest that gravity waves carry more energy than co-spatial acoustic waves. This work presents an exploration of the upward propagation of gravity waves from the photosphere to the chromosphere, in a realistic model of the solar atmosphere. The purpose is to determine what happens to upward propagating gravity waves when they reach regions where the magnetic forces dominate. Wave motions are assumed linear and the atmosphere is static and horizontally invariant. Dispersion and ray diagrams provide insight into the mode con¬version mechanism. Numerical solution of the linear adiabatic wave equations quantify wave energy fluxes. The analysis shows that typically even weak magnetic fields cause the gravity wave to reflect back downwards as a slow magneto-acoustic wave well before the Alfven-acoustic equipartition level, and it fails to reach the chromosphere. However, highly inclined magnetic fields allow gravity waves to penetrate the equipartition level and experience substantial mode conversion to up-going Alfven waves, or field-guided acoustic waves. Wave energy fluxes are sensitive to the magnetic field orientation and short radiative damping times, but are insensitive to the magnetic field strengths over the range considered (lOG -100 G). The mode conversion pathways found in adiabatic analyses are preserved in the presence of damping. Mode conversion of gravity waves to Alfven waves is a possible pathway to the upper atmosphere for wave energy. The cause of the high frequency enhancement (the acoustic glory) in seismic power surrounding large active regions with complex field structures is not yet understood. This work presents an investigation of the properties of the seismic emission power and acoustic power of large active regions that have acoustic glories. Helioseismic holography is used to create seismic emission power maps for six large active regions with complex magnetic field structures. Acoustic glories are visible in high-frequency seismic emission power maps (5.0 mHz -7.0 mHz) for all active regions studied. The analysis of acoustic power about large active regions, in high and low frequency regimes, confirms behaviours that are consistent with the findings of previous analyses of smaller active regions. Several new properties of high frequency seismic emission power associated with large active regions are identified: The maximum enhancements in seismic emission and acoustic power occur at different spatial locations; acoustic glories are most prominent in seismic emission power maps in the 5.0 mHz -6.0 mHz bandwidth; the radius of the acoustic glory reduces as frequency increases; and the mean value of high frequency (above 5.0 mHz) seismic emission power for the active regions studied was enhanced at intermediate line-of-sight magnetic flux densities (50 G -300 G).
Author | : B. N. Dwivedi |
Publisher | : World Scientific |
Total Pages | : 294 |
Release | : 2008 |
Genre | : Science |
ISBN | : 9812832718 |
This book presents a pedagogical, updated and modern view of the Sun from its interior to its exterior as well as the Sun?Earth system. Written by eminent scientists in solar physics, the chapters deal with recent advances in solar physics, seismic Sun, solar magnetic field, waves and oscillations, spectroscopic diagnostics of solar plasmas, partially ionized lower atmosphere, coronal heating, coronal mass ejections, radio Sun, solar wind, and the Sun?Earth system. Each chapter is fully illustrated and has a comprehensive reference list. The book covers all major topics in solar physics, and presents a rich menu to motivate graduate students who wish to pursue a solar physics research career.
Author | : Arthur N. Cox |
Publisher | : University of Arizona Press |
Total Pages | : 1435 |
Release | : 2018-01-30 |
Genre | : Science |
ISBN | : 0816538611 |
Observational data derived from the world’s largest solar telescopes are correlated with theoretical discussions in nuclear and atomic physics by contributors representing a wide range of interests in solar research.
Author | : Smithsonian Astrophysical Observatory |
Publisher | : |
Total Pages | : 5 |
Release | : 1902 |
Genre | : |
ISBN | : |
Author | : Jacques Maurice Beckers |
Publisher | : |
Total Pages | : 90 |
Release | : 1975 |
Genre | : Magnetic fields |
ISBN | : |
The report presents two papers on observational evidence for large and small scale motions in the solar atmosphere.