Computer Science
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..247s&link_type=abstract
In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,
Computer Science
Sunspot Filter Theory, Sunspot Oscillations, Artificial Power Spectra
Scientific paper
Sunspot oscillations are observed in spectral lines formed at different depths in the sunspot atmosphere. The interpretation of measurements in chromospheric lines is problematic as the lines are formed in NLTE. So the measured power spectra do not originate from one specific depth in the atmosphere but are smoothed out over a larger region. This will also influence the phase shifts of the waves measured in different spectral lines and might cause some misinterpretation. These complications are illustrated by our model calculations: Modelling the transmission of magneto-atmospheric waves through the sunspot atmosphere by means of the sunspot filter approach, we show the "real" power spectra at different atmospheric depths. These results are compared with Ca II-H/K power spectra gained from the NLTE calculations of the Ca II-H/K lines in an atmosphere perturbed by our waves. All results are preliminary.
Settele A.
Staude Jakob
Zhugzhda Yu. D.
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