Waves & oscillations in the solar atmosphere: heating and magneto-seismology : proceedings of the 247th Symposium of the International Astronomical Union held in Porlamar, Isla de Margarita, Venezuela, September 17 - 22, 2007
Title | Waves & oscillations in the solar atmosphere: heating and magneto-seismology : proceedings of the 247th Symposium of the International Astronomical Union held in Porlamar, Isla de Margarita, Venezuela, September 17 - 22, 2007 PDF eBook |
Author | Robertus Erdélyi |
Publisher | |
Pages | 0 |
Release | 2008 |
Genre | Helioseismology |
ISBN |
Waves and Oscillations in the Solar Atmosphere (IAU S247)
Title | Waves and Oscillations in the Solar Atmosphere (IAU S247) PDF eBook |
Author | International Astronomical Union. Symposium |
Publisher | Cambridge University Press |
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.
Proceedings of the Twenty Sixth General Assembly Prague 2006
Title | Proceedings of the Twenty Sixth General Assembly Prague 2006 PDF eBook |
Author | International Astronomical Union. General Assembly |
Publisher | Cambridge University Press |
Pages | 530 |
Release | 2008-12-18 |
Genre | Science |
ISBN | 9780521856065 |
IAU Transactions XXVIB contains the Proceedings of the IAU XXVII General Assembly held in Prague, 14-25 August 2006, hosting a total of 2412 participants from 73 countries. The Assembly featured a rich scientific program, comprising 6 Symposia, 17 Joint Discussions and 7 Special Sessions. During the program about 650 papers were presented and more than 1550 posters displayed. The Proceedings of the 6 Symposia have been published in the Proceedings of the IAU Symposia Series, and the proceedings of the Joint Discussions and Special Sessions feature in IAU Highlights of Astronomy, 14. Together with those 7 volumes, these Transactions cover the entire General Assembly. In addition to the scientific program, the XXVI General Assembly hosted the regular Business Meetings of the EC, the 12 Divisions, 40 Commissions and 75 Working Groups. This volume records the organizational and administrative business of the XXVI General Assembly and the status of the IAU membership.
Magnetohydrodynamic Waves in the Solar Atmosphere: Heating and Seismology
Title | Magnetohydrodynamic Waves in the Solar Atmosphere: Heating and Seismology PDF eBook |
Author | Tom Van Doorsselaere |
Publisher | Frontiers Media SA |
Pages | 170 |
Release | 2020-02-27 |
Genre | |
ISBN | 2889635252 |
MHD Waves in the Solar Atmosphere
Title | MHD Waves in the Solar Atmosphere PDF eBook |
Author | Bernard Roberts |
Publisher | Cambridge University Press |
Pages | 529 |
Release | 2019-07-18 |
Genre | Mathematics |
ISBN | 1108427669 |
Develops a fresh mathematical approach to coronal seismology, explaining oscillatory phenomena by drawing upon original research and complex modelling techniques.
Solar Magneto-atmospheric Oscillations
Title | Solar Magneto-atmospheric Oscillations PDF eBook |
Author | Marie Elizabeth Newington |
Publisher | |
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).
Third Advances in Solar Physics Euroconference
Title | Third Advances in Solar Physics Euroconference PDF eBook |
Author | Brigitte Schmieder |
Publisher | |
Pages | 394 |
Release | 1999 |
Genre | Science |
ISBN |