Time-Distance Analysis of Sunspots and Contamination by Solar Surface Effects

Details Time-Distance Analysis of Sunspots and Contamination by Solar Surface Effects Time-Distance Analysis of Sunspots and Contamination by Solar Surface Effects

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2214c&link_type=abstract

American Astronomical Society Meeting 210, #22.14; Bulletin of the American Astronomical Society, Vol. 39, p.126

Computer Science

Sound

Scientific paper

Using Doppler velocity data from the SOI/MDI instrument onboard the SoHO spacecraft, we perform time-distance helioseismic inversions for sound-speed perturbations beneath 16 sunspots. We clearly detect ring-like regions of enhanced sound speed beneath most sunspot penumbrae, extending from near the surface to depths of about 3.5 Mm. Due to their location and dependence on frequency bands of p-modes used, we believe these rings to be artifacts produced by a surface signal probably associated with the sunspot magnetic field.

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