NDLI: PERIODIC SPECTRAL LINE ASYMMETRIES IN SOLAR CORONAL STRUCTURES FROM SLOW MAGNETOACOUSTIC WAVES

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PERIODIC SPECTRAL LINE ASYMMETRIES IN SOLAR CORONAL STRUCTURES FROM SLOW MAGNETOACOUSTIC WAVES

Content Provider	Scilit
Author	Verwichte, E. Marsh, Michael Foullon, C. Doorsselaere, Tom Van Moortel, I. De Hood, A. W. Nakariakov, Valery
Copyright Year	2010
Description	Journal: The Astrophysical Journal Letters 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.
Related Links	https://iopscience.iop.org/article/10.1088/2041-8205/724/2/L194/pdf
Ending Page	L198
Page Count	5
Starting Page	L194
ISSN	20418205
DOI	10.1088/2041-8205/724/2/l194
Journal	The Astrophysical Journal Letters
Issue Number	2
Volume Number	724
Language	English
Publisher	IOP Publishing
Publisher Date	2010-11-10
Access Restriction	Open
Subject Keyword	Journal: The Astrophysical Journal Letters Astronomy and Astrophysics Quasi Periodic Magnetoacoustic Waves Intensity Perturbations Line Asymmetries Slow Magnetoacoustic
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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