Title: Periodic spectral line asymmetries in solar coronal structures from slow magnetoacoustic waves
Authors: Verwichte, E ×
Marsh, M
Foullon, C
Van Doorsselaere, Tom
De Moortel, I
Hood, A. W
Nakariakov, V. M #
Issue Date: Dec-2010
Publisher: I O P Publishing Ltd.
Series Title: The Astrophysical Journal. Letters vol:724 issue:2 pages:L194-L198
Abstract: 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.
ISSN: 2041-8205
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Plasma-astrophysics Section
× corresponding author
# (joint) last author

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