SIMULTANEOUS TRANSVERSE OSCILLATIONS OF A PROMINENCE AND A FILAMENT AND LONGITUDINAL OSCILLATION OF ANOTHER FILAMENT INDUCED BY A SINGLE SHOCK WAVE

We present the first stereoscopic and Doppler observations of simultaneous transverse oscillations of a prominence and a filament and longitudinal oscillation of another filament launched by a single shock wave. Using H alpha Doppler observations, we derive the three-dimensional oscillation velociti...

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Bibliographic Details
Published in:The Astrophysical journal 2014-11, Vol.795 (2), p.1-14
Main Authors: SHEN, YUANDENG, Liu, Ying D, Chen, P F, ICHIMOTO, KIYOSHI
Format: Article
Language:English
Subjects:
ALTITUDE
AMPLITUDES
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COUPLING
DAMPING
DOPPLER EFFECT
Filaments
GRAVITATION
MAGNETIC FIELDS
OSCILLATIONS
Prominences
REFLECTION
Rigid-body dynamics
SHOCK WAVES
SUN
THREE-DIMENSIONAL CALCULATIONS
VELOCITY
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Summary:We present the first stereoscopic and Doppler observations of simultaneous transverse oscillations of a prominence and a filament and longitudinal oscillation of another filament launched by a single shock wave. Using H alpha Doppler observations, we derive the three-dimensional oscillation velocities at different heights along the prominence axis. The results indicate that the prominence has a larger oscillation amplitude and damping time at higher altitude, but the periods at different heights are the same (i.e., 13.5 minutes). This suggests that the prominence oscillates like a linear vertical rigid body with one end anchored on the Sun. One of the filaments shows weak transverse oscillation after the passing of the shock, which is possibly due to the low altitude of the filament and the weakening (due to reflection) of the shock wave before the interaction. Large-amplitude longitudinal oscillation is observed in the other filament after the passing of the shock wave. The velocity amplitude and period are about 26.8 kms super(-1) and 80.3 minutes, respectively. We propose that the orientation of a filament or prominence relative to the normal vector of the incoming shock should be an important factor for launching transverse or longitudinal filament oscillations. In addition, the restoring forces of the transverse prominence are most likely due to the coupling of gravity and magnetic tension of the supporting magnetic field, while that for the longitudinal filament oscillation is probably the resultant force of gravity and magnetic pressure.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/795/2/130