Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-01-28
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Proceedings article for NSO Workshop #25 "Chromospheric Structure and Dynamics" (2009), to appear in Memorie della Societa Ast
Scientific paper
From the analysis of Dopplergrams in the K I 7699 A and Na I 5890 A spectral lines observed with the Magneto-Optical filter at Two Heights (MOTH) experiment during the austral summer in 2002-03 we find upward traveling waves in magnetic regions. Our analysis shows that the dispersion relation of these waves strongly depends on whether the wave is detected in the low-beta or high-beta regime. Moreover, the observed dispersion relation does not show the expected decrease of the acoustic cut-off frequency for the field guided slow magnetic wave. Instead, we detected an increase of the travel times below the acoustic cut-off frequency and at the same time a decrease of the travel time above it. To study the formation height of the spectral lines employed by MOTH in greater detail we are currently in the process of employing 3D MHD simulations carried out with CO5BOLD to perform NLTE spectral synthesis.
Finsterle Wolfgang
Haberreiter Margit
McIntosh Scott
Wedemeyer-Boehm Sven
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