Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp13a..02z&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SP13A-02
Other
7522 Helioseismology, 7524 Magnetic Fields
Scientific paper
Recent observation by phase-sensitive acoustic holography has shown that the inclined magnetic field has significant effects over the local helioseismology measurements, and it was thus suggested that the acoustic wave phase shift is substantially caused by the photospheric magnetic field. We make the similar measurements by use of time-distance helioseismology technique over a sunspot when it rotated from the solar east limb to the west. We find that the wave travel time is often longer in the part of sunspot penumbra that is closer to the solar disk center, similar to what was found by acoustic holography analysis. We investigate the other possible reasons that may cause this effect, e.g., projection effect, Doppler velocity masking effect, and find these effects do not account for all the travel time variations. We perform time-distance inversions to investigate how these measurements affect interior structures inferred from inversions.
Kosovichev Aleksandr G.
Zhao Jun
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