Time-distance Helioseismology Study Over a Rotating Sunspot

Details Time-distance Helioseismology Study Over a Rotating Sunspot Time-distance Helioseismology Study Over a Rotating Sunspot

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh11b0708z&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH11B-0708

Computer Science

Sound

7522 Helioseismology

Scientific paper

Time-distance helioseismology has provided a unique tool in studying interior structures of the Sun. The structure of sound speed variations and flow fields beneath the sunspot surface have been obtained by use of inversion technique in some previous studies. In this study we have applied the time-distance measurements from SOHO/MDI and the inversion technique to investigate a sunspot which showed unusually fast rotation around its center for a couple of days from Aug 7 to Aug 8, 2000. The sound speed structure which is related to the magnetic field structures beneath the surface and associated temperature variations was obtained. The results revealed some twists in the sound-speed internal structure of the spot relative to the surface magnetic structure. This kind of subsurface twist was not seen 2 days after the start of rotation. This is consistent with the surface observation showing a reduction of transverse magnetic field twists after the surface rotation stopped. It could be explained as the magnetic field lines were twisted beneath the surface and the untwisting of field lines caused the surface rotation. Flow fields beneath the sunspot surface were also obtained. A strong vortex was found near the surface and a few megameters below the surface. Whether the subsurface vortical flows caused the magnetic field twists or the untwisting of field lines caused the subsurface vortical flows will be discussed.

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