Journal
ASTROPHYSICAL JOURNAL
Volume 584, Issue 2, Pages L103-L106Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/373886
Keywords
Sun : corona; Sun : filaments; Sun : oscillations; Sun : prominences
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A type of mass motion in solar filaments, not previously reported, is studied with high-cadence (1 minute) Halpha observations made at the Big Bear Solar Observatory on 2001 October 24. This oscillatory motion is along the filament and extends over a long distance (similar to1.4 x 10(5) km) with a period of similar to80 minutes and a very high velocity amplitude of similar to92 km s(-1). Another significant property of this oscillation is that it is triggered by a subflare that occurred near its footpoint. The oscillation completes three cycles before it damps out over a timescale of similar to210 minutes. We mainly discuss whether this oscillation is an extreme form of the recently discovered counterstreaming flows in filaments or is a form of the large-amplitude filament oscillations (known as a winking filament) discovered a half-century ago.
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