Time-distance helioseismology and the magnetic atmoŝphere of the sun
| Type | Conference Proceeding (Non-Journal item) |
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| Original language | English |
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| Title of host publication | Proceedings of the Conference SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: |
| Subtitle of host publication | A Joint View from SOHO and TRACE |
| Pages | 33-38 |
| Number of pages | 6 |
| Edition | 547 |
| Publication status | Published - 2004 |
| Event | Proceedings of the Conference SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE - Balearic Islands, Spain Duration: 29 Sep 2003 → 03 Oct 2003 |
Publication series
| Name | European Space Agency, (Special Publication) ESA SP |
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| ISSN (Print) | 0379-6566 |
Conference
| Conference | Proceedings of the Conference SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE |
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| Country | Spain |
| City | Balearic Islands |
| Period | 29 Sep 2003 → 03 Oct 2003 |
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Abstract
In time-distance helioseismology the travel time of the acoustic waves between different points on the solar surface is measured to infer the local structure and properties of the subsurface layers of the Sun. The presence of the magnetic canopy in the solar atmosphere is expected to modify the behavior of the acoustic waves. The travel time changes due to the atmospheric magnetic field are evaluated theoretically. The uniform magnetic field in the atmosphere shortens the travel time of the acoustic waves due to enhanced rigidity of the interface where the waves are reflected. This effect increases rapidly with increasing frequency and harmonic degree. The effect of the magnetic field on the acoustic wave travel time is compared with the corresponding effect of large-scale sub-surface flows. It is suggested to use the time-distance analysis as a diagnostic tool in determining the local properties of the Sun's atmospheric magnetic field.
Keywords
- Magnetic canopy, Sun, Time-distance helioseismology