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On the observation of traveling acoustic waves in the solar atmosphere using a magneto‐optical filter
Author(s) -
Haberreiter M.,
Finsterle W.,
Jefferies S. M.
Publication year - 2007
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200610721
Subject(s) - physics , atmosphere (unit) , solar atmosphere , optics , irradiance , radiative transfer , filter (signal processing) , signal (programming language) , acoustic wave , acoustics , computational physics , meteorology , magnetic field , quantum mechanics , computer science , computer vision , programming language
In contrast to low‐frequency waves that are trapped in the cavity of the Sun, high‐frequency waves can travel freely in the solar atmosphere. By modelling the observed intensity signal in the red and blue wings of K I 7699 Å and Na I 5890 Å, we aim to better understand the measurements carried out with the Magneto‐Optical Filter at Two Heights (MOTH) experiment. We model the observed intensity signal with radiative transfer calculations carried out with the COde for Solar Irradiance (COSI). Furthermore, we derive the formation height of the lines in order to analyze to what extent the contribution functions are modulated by the acoustic waves. We find a phase lag between the red and blue filter for acoustic waves with a frequency above ≈7 mHz and conclude that a frequency dependent data analysis is required for higher frequencies. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)