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seismology_overview [2024/07/15 22:47] jasonjseismology_overview [2024/08/02 19:32] (current) – [Helioseismology] jasonj
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-[{{:wiki:science:sun-meridional-zhao.jpg?nolink&200 |The possible structure of the meridional flows in the Sun's convection zone. Such a configuration is a puzzle for those who try to determine how the Sun generates its magnetic fields.}}]+[{{:wiki:science:sun-meridional-zhao.jpg?direct&250 |The possible structure of the meridional flows in the Sun's convection zone. Such a configuration is a puzzle for those who try to determine how the Sun generates its magnetic fields. }}]
  
  
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 Other types of modes provide even more powerful diagnostics of interior conditions. In subsurface convectively-stable regions of stars, such as the cores of red giants, low-frequency gravity modes are excited. While they are not visible at the surface, they can interact and `mix' with acoustic modes and impart new information in the power spectrum. New frequency spacings appear, which can be used as diganostics of the core region, capable of providing the evolutionary state or inferring the core rotation rate. Other types of modes provide even more powerful diagnostics of interior conditions. In subsurface convectively-stable regions of stars, such as the cores of red giants, low-frequency gravity modes are excited. While they are not visible at the surface, they can interact and `mix' with acoustic modes and impart new information in the power spectrum. New frequency spacings appear, which can be used as diganostics of the core region, capable of providing the evolutionary state or inferring the core rotation rate.
  
-All of the above may be considered as a broad application of asteroseismic analysis of global observables. SONG will go much further than applying the scaling relations. It will provide very precise individual mode frequencies for more modes than space photometry can, including mixed modes, L=3 modes, and modes split into multiplets by internal rotation.  In fact, the relative amplitudes of the frequency multiplets can be used to measure the inclination of the stellar rotation axis {[gizon2003]}. In any case, the measured frequencies can then be confronted with the frequencies predicted from sophisticated numerical models. The result is a deeper understanding of all of the interior stellar properties and evolutionary state of stars.  +All of the above may be considered as a broad application of asteroseismic analysis of global observables. Some high-precision observations, such as those from [[http://astronomy.nmsu.edu/song-wiki/start|SONG]], will go much further than applying the scaling relations. They can provide very precise individual mode frequencies for more modes than space photometry can, including mixed modes, L=3 modes, and modes split into multiplets by internal rotation.  In fact, the relative amplitudes of the frequency multiplets can be used to measure the inclination of the stellar rotation axis {[gizon2003]}. In any case, the measured frequencies can then be confronted with the frequencies predicted from sophisticated numerical models. The result is a deeper understanding of all of the interior stellar properties and evolutionary state of stars.  
  
 +==== Giant-Planet Seismology ====
  
 +A detailed discussion about this topic can be found on the [[jive_in_nm|JIVE]] page.
  
 ===== References ===== ===== References =====
seismology_overview.1721083641.txt.gz · Last modified: 2024/07/15 22:47 by jasonj