Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-09-13
Astrophysical Journal Letters 721 (2010) L86-L91
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
12 pages, 5 figures, To appear in the Astrophysical Journal Letters
Scientific paper
10.1088/2041-8205/721/2/L86
Using a high cadence imaging spectropolarimetric observation of a sunspot and its surroundings in magnetically sensitive (FeI 6173 A) and insensitive (FeI 7090 A) upper photospheric absorption lines, we map the instantaneous wave phases and helioseismic travel times as a function of observation height and inclination of magnetic field to the vertical. We confirm the magnetic inclination angle dependent transmission of incident acoustic waves into upward propagating waves, and derive (1) proof that helioseismic travel times receive direction dependent contributions from such waves and hence cause errors in conventional flow inferences, (2) evidences for acoustic wave sources beneath the umbral photosphere, and (3) significant differences in travel times measured from the chosen magnetically sensitive and insensitive spectral lines.
Couvidat Sebastien
Rajaguru S. P.
Sankarasubramanian Kasiviswanathan
Wachter R.
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