Verwichte, E., Marsh, Michael, Foullon, C., Van Doorsselaere, T., De Moortel, I., Hood, A. W. and Nakariakov, V. M. (2010) PERIODIC SPECTRAL LINE ASYMMETRIES IN SOLAR CORONAL STRUCTURES FROM SLOW MAGNETOACOUSTIC WAVES. The Astrophysical Journal, 724 (2). L194-L198. ISSN 2041-8205
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Official URL: http://dx.doi.org/10.1088/2041-8205/724/2/L194
Recent spectral observations of upward moving quasi-periodic intensity perturbations in solar coronal structures have shown evidence of periodic line asymmetries near their footpoints. These observations challenge the established interpretation of the intensity perturbations in terms of propagating slow magnetoacoustic waves. We show that slow waves inherently have a bias toward enhancement of emission in the blue wing of the emission line due to in-phase behavior of velocity and density perturbations. We demonstrate that slow waves cause line asymmetries when the emission line is averaged over an oscillation period or when a quasi-static plasma component in the line of sight is included. Therefore, we conclude that slow magnetoacoustic waves remain a valid explanation for the observed quasi-periodic intensity perturbations.
|Uncontrolled Keywords (separate with ;):||line: formation; magnetohydrodynamics (MHD); Sun: corona; Sun: oscillations;|
|Subjects:||Physical sciences > Astronomy|
Physical sciences > Physics
|Schools:||Faculty of Science and Technology > School of Physical Sciences and Computing > Jeremiah Horrocks Institute|
|Deposited By:||Nuala Jones|
|Deposited On:||05 Mar 2013 13:24|
|Last Modified:||09 Aug 2016 15:17|
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