We present observations of four filaments that exhibit large-amplitude periodic mass motion. Observations are obtained using the high resolution (2″) and high cadence (1 min) Hα telescope system at the Big Bear Solar Observatory (BBSO). The motions found in these events are along the axis of the filaments, and are associated with the activity of a nearby flare or filament. The most characteristic properties of these motions are long period (≥80 min), large distance (≥ 4 × 104 km) of mass transport at much higher velocity (≥ 30 km s-1) than ever detected from filament motions. The velocity, period, dimension and damping timescale measured for these motions are presented, and discussed to identify the most plausible restoring force and damping mechanism.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science