Abstract
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 km/s 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.