Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2411t&link_type=abstract
American Astronomical Society Meeting 210, #24.11; Bulletin of the American Astronomical Society, Vol. 39, p.130
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The presence of enhanced magnetic fields in active regions is known to suppress acoustic power and modify oscillation frequencies. Applying the ring diagram technique to data from three different spectral lines at different heights in the solar atmosphere, we analyze the variation of the acoustic power with height. The data sets include simultaneous Dopplergrams obtained with the Ni I 676.8 nm from Global Oscillation Network Group (GONG), K I 769.9 nm from Magneto-Optical Filters at Two Heights (MOTH) and Na I 589.0 nm from MOTH and Mount Wilson Observatory (MWO). It should be noted that the Ni and K lines are formed in the photosphere while Na line is formed in lower chromosphere. Preliminary results suggest a difference in power suppression with increasing height, which can be explained in terms of the expanding magnetic flux tubes.
Armstrong James D.
Gonzalez-Hernandez Irene
Hill F. F.
Jain Kunal
Jefferies Stuart M.
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