Radiative Transfer Effects on Doppler Measurements as Sources of Surface Effects in Sunspot Seismology | Zendy

S. P. Rajaguru | Zendy; K. Sankarasubramanian | Zendy; R. Wachter | Zendy; P. H. Scherrer | Zendy

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Radiative Transfer Effects on Doppler Measurements as Sources of Surface Effects in Sunspot Seismology

Author(s) -

S. P. Rajaguru,

K. Sankarasubramanian,

R. Wachter,

P. H. Scherrer

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/511266

Subject(s) - zeeman effect , sunspot , doppler effect , physics , helioseismology , polarization (electrochemistry) , radiative transfer , spectral line , computational physics , phase (matter) , optics , magnetic field , earth's magnetic field , doppler broadening , astrophysics , astronomy , chemistry , quantum mechanics

We show that the use of Doppler shifts of Zeeman sensitive spectral lines toobserve wavesn in sunspots is subject to measurement specific phase shiftsarising from, (i) altered height range of spectral line formation and thepropagating character of p mode waves in penumbrae, and (ii) Zeeman broadeningand splitting. We also show that these phase shifts depend on wave frequencies,strengths and line of sight inclination of magnetic field, and the polarizationstate used for Doppler measurements. We discuss how these phase shifts couldcontribute to local helioseismic measurements of 'surface effects' in sunspotseismology.Comment: 12 pages, 4 figures, Accepted for publication in the Astrophysical Journal Letter

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