Time-distance helioseismology and the magnetic atmoŝphere of the sun

Y. Taroyan*, R. Erdélyi, J. G. Doyle

*Awdur cyfatebol y gwaith hwn

Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddTrafodion Cynhadledd (Nid-Cyfnodolyn fathau)

2 Dyfyniadau (Scopus)

Crynodeb

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.

Iaith wreiddiolSaesneg
TeitlProceedings of the Conference SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere:
Is-deitlA Joint View from SOHO and TRACE
Tudalennau33-38
Nifer y tudalennau6
Argraffiad547
StatwsCyhoeddwyd - 2004
DigwyddiadProceedings 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, Sbaen
Hyd: 29 Medi 200303 Hyd 2003

Cyfres gyhoeddiadau

EnwEuropean Space Agency, (Special Publication) ESA SP
ISSN (Argraffiad)0379-6566

Cynhadledd

CynhadleddProceedings of the Conference SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE
Gwlad/TiriogaethSbaen
DinasBalearic Islands
Cyfnod29 Medi 200303 Hyd 2003

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