Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...724l.194v&link_type=abstract
The Astrophysical Journal Letters, Volume 724, Issue 2, pp. L194-L198 (2010).
Astronomy and Astrophysics
Astronomy
13
Line: Formation, Magnetohydrodynamics: Mhd, Sun: Corona, Sun: Oscillations
Scientific paper
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.
de Moortel Ineke
Doorsselaere Tom Van
Foullon Claire
Hood Alan William
Marsh Michael
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