Computer Science – Sound
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010an....331..873k&link_type=abstract
Astronomische Nachrichten, Vol.331, Issue 9/10, p.873
Computer Science
Sound
Sun: Helioseismology, Sun: Interior, Sun: Magnetic Fields
Scientific paper
The frequency variation of global modes provides information about the solar structure and the rotation rate of the solar interior. The solar-cycle variation of the rotation rate, the so-called torsional oscillation, extends throughout the convection zone. Alternating bands of faster- and slower-than-average rotation move from mid-latitudes toward the equator during the solar cycle. The variation of the meridional flow, measured with local helioseismic techniques, is of similar amplitude. The zonal- and the meridional-flow variation related to a new cycle are noticeable years before magnetic activity of the new cycle is present at the surface. The sound-speed variations show a small, but significant variation with the solar cycle near the base of the convection zone, which might be interpreted as a change in magnetic field strength. The mode characteristics, such as acoustic radius and frequency shifts, provide information about changes in the near-surface layers, where acoustic modes are excited.
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