Computer Science – Sound
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp22a04z&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP22A-04 INVITED
Computer Science
Sound
7522 Helioseismology
Scientific paper
Time-distance helioseismic technique has provided a useful tool to study the interior structure of the Sun. The inversion of time-distance measurements can help us reveal mass flows and sound speed perturbation beneath the solar surface. We have applied time-distance measurements to a set of high resolution Dopplergram observations of a sunspot by SOHO/MDI, and a regularized damped least-squares inversion was used to infer the mass flows beneath this sunspot. Powerful converging and downward flows are detected at a depth of 1.5 to 5 Mm, which may provide observational evidence for the cluster sunspot model. Strong outflows which extend more than 30Mm outside the center of the sunspot are found below 5Mm. A full disk observation of an interesting event in August 2000, an apparent spin of a sunspot, was also analyzed by the same approach but with lower resolution. For this event a vortex flow has been detected in subsurface layers. This may provide an insight into the study of helicity below the photosphere of the Sun.
Duvall Thomas L.
Kosovichev Aleksandr G.
Zhao Jun
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