Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-29
Astronomy and Astrophysics
Astrophysics
12 pages, 4 figures, Accepted for publication in the Astrophysical Journal Letters
Scientific paper
10.1086/511266
We show that the use of Doppler shifts of Zeeman sensitive spectral lines to observe wavesn in sunspots is subject to measurement specific phase shifts arising from, (i) altered height range of spectral line formation and the propagating character of p mode waves in penumbrae, and (ii) Zeeman broadening and splitting. We also show that these phase shifts depend on wave frequencies, strengths and line of sight inclination of magnetic field, and the polarization state used for Doppler measurements. We discuss how these phase shifts could contribute to local helioseismic measurements of 'surface effects' in sunspot seismology.
Rajaguru S. P.
Sankarasubramanian Kasiviswanathan
Scherrer Philip H.
Wachter R.
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