NDLI: Periods and Damping Rates of Fast Sausage Oscillations in Multishelled Coronal Loops

Content Provider	Springer Nature Link
Author	Chen, Shao Xia Li, Bo Xia, Li Dong Yu, Hui
Copyright Year	2015
Abstract	Standing sausage modes are important in interpreting quasi-periodic pulsations in the light curves of solar flares. Their periods and damping times play an important role in seismologically diagnosing key parameters like the magnetic field strength in regions where flare energy is released. Usually, such applications are based on theoretical results neglecting unresolved fine structures in magnetized loops. However, the existence of fine structuring is suggested on both theoretical and observational grounds. Adopting the framework of cold magnetohydrodynamics (MHD), we model coronal loops as magnetized cylinders with a transverse equilibrium density profile comprising a monolithic part and a modulation due to fine structuring in the form of concentric shells. The equation governing the transverse velocity perturbation is solved with an initial-value-problem approach, and the effects of fine structuring on the periods $P$ and damping times $\tau$ of global, leaky, standing sausage modes are examined. A parameter study shows that fine structuring, be it periodically or randomly distributed, brings changes of only a few percents to $P$ and $\tau$ when there are more than about ten shells. The monolithic part, its steepness in particular, plays a far more important role in determining $P$ and $\tau$ . We conclude that when measured values of $P$ and $\tau$ of sausage modes are used for seismological purposes, it is justified to use theoretical results where the effects due to fine structuring are neglected.
Starting Page	2231
Ending Page	2243
Page Count	13
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	290
Issue Number	8
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-08-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coronal seismology Magnetic fields, corona Waves, magnetohydrodynamic Astrophysics and Astroparticles Atmospheric Sciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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