Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997assl..225..235s&link_type=abstract
SCORe'96 : Solar Convection and Oscillations and their Relationship, Proceedings of a workshop, held in Aarhus, Denmark, May 27
Astronomy and Astrophysics
Astrophysics
Sunspot Oscillations, Two-Dimensional Spectroscopy, High-Resolution Observations
Scientific paper
High-resolution two-dimensional spectro-polarimetric observations of oscillations in the photospheric layers of a sunspot have been obtained using the Vacuum Tower Telescope at Tenerife. A Fabry-Perot interferometer has been applied to get narrow-band filtergrams directly and to scan through the line profile. The spectra show significant power of oscillations of velocity $v$ and of the magnetic field strength as well. Both are concentrated in bands of peaks at periods around 3 min ($v$ strengthened) and 5 min ($v$ weakened with respect to the quiet Sun), with maxima occuring in those parts of the umbra where the magnetic lines of force are parallel to the line-of-sight. Coherence and the phase difference between both types of oscillations show a clear dependence on the magnetic field direction as well.
Horn Tassilo
Staude Jakob
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