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Studies of waves in sunspots using spectropolarimetric observations

Published online by Cambridge University Press:  26 August 2011

Gordon A. MacDonald  and
S. P. Rajaguru
Gordon A. MacDonald
Affiliation:
California State University, Northridge, 18111 Nordhoff St., Northridge, CA 91330, USA email: gordon.macdonald.31@my.csun.edu
S. P. Rajaguru
Affiliation:
Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034, INDIA email: rajaguru@iiap.res.in
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Abstract

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We observe the acoustic velocity oscillations in and near active region NOAA 10960 on 8 June, 2007 using observations from the IBIS instrument at the Dunn Solar Telescope at NSO/Sacramento Peak and simultaneous Hinode BFI/SP data. Inversions were performed on the spectropolarimetric datasets in order to get magnetic field information for the AR. A time series of Doppler maps from line bisectors and Stokes V zero-crossing was constructed and allowed us to construct power maps for the AR. Past works by various authors have shown that acoustic power in the solar atmosphere is strongly influenced by magnetic field strength and inclination. Our study also explores this, but in addition, we also discuss the role of oscillations due to purely magnetized gas in the photosphere. Our preliminary results for this study are presented.

Keywords

Local helieseismologyactive regions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 361 - 365
Copyright
Copyright © International Astronomical Union 2011

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