Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..681l&link_type=abstract
In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze
Physics
2
Solar Filaments: Oscillations
Scientific paper
The small-scale dynamics of solar prominences/filaments are intimately connected to their magnetic fields. High-resolution observations of segments of an extensive filament were obtained on May 6th, 2000 with the Richard B. Dunn Solar Telescope of NSO. Time series of images covering 184×184 arc sec FOV were recorded at three wavelength positions in Hα which enable us to study of small-scale Doppler motions as well as motions perpendicular to the sight line. The study shows oscillatory motions of periods ranging from 5 to 23 minutes; - the most frequently occurring period is about 12 minutes. The amplitudes are around 0.5 km s-1. One finds, furthermore, the transverse flows at velocities on the average about 5 km s-1. In filament barbs the flows are predominant in the direction into the filament. Phase shift of the oscillatory signals propagates in the direction of the thread at velocities of about 16 km s-1, i.e. close to three times of the typical flow speed in the threads.
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