Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-24
Astrophys.J. 671 (2007) 1005-1012
Astronomy and Astrophysics
Astrophysics
17 pages, 6 figures, accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/523266
We seek to clarify the nature of running penumbral (RP) waves: are they chromospheric trans-sunspot waves or a visual pattern of upward-propagating waves? Full Stokes spectropolarimetric time series of the photospheric Si I 10827 \AA line and the chromospheric He I 10830 \AA multiplet were inverted using a Milne-Eddington atmosphere. Spatial pixels were paired between the outer umbral/inner penumbral photosphere and the penumbral chromosphere using inclinations retrieved by the inversion and the dual-height pairings of line-of-sight velocity time series were studied for signatures of wave propagation using a Fourier phase difference analysis. The dispersion relation for radiatively cooling acoustic waves, modified to incorporate an inclined propagation direction, fits well the observed phase differences between the pairs of photospheric and chromospheric pixels. We have thus demonstrated that RP waves are in effect low-beta slow-mode waves propagating along the magnetic field.
Bloomfield Shaun D.
Lagg Andreas
Solanki Sami K.
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