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The nature of running penumbral waves revealed

Published online by Cambridge University Press:  01 September 2007

D. S. Bloomfield ,
A. Lagg  and
S. K. Solanki
D. S. Bloomfield
Affiliation:
Max Planck Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany email: bloomfield@mps.mpg.de; lagg@mps.mpg.de; solanki@mps.mpg.de
A. Lagg
Affiliation:
Max Planck Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany email: bloomfield@mps.mpg.de; lagg@mps.mpg.de; solanki@mps.mpg.de
S. K. Solanki
Affiliation:
Max Planck Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany email: bloomfield@mps.mpg.de; lagg@mps.mpg.de; solanki@mps.mpg.de
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Abstract

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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 Sii10827 Å line and the chromospheric Hei10830 Å multiplet were inverted using a Milne-Eddington code. 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-β slow-mode waves propagating along the magnetic field.

Keywords

Sun: infrared – Sun: magnetic fields – Sun: sunspots – Techniques: polarimetric – Waves
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S247: Waves & Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology , September 2007 , pp. 55 - 58
Copyright
Copyright © International Astronomical Union 2008

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