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The evolution of barbs on a polar crown filament observed by SDO View all abstracts by submitter

Leping Li   Submitted: 2012-05-07 01:21

From August 16 to 21, 2010, a northern (~ N60) polar crown filament was observed by Solar Dynamics Observatory (SDO). Employing the six day SDO/AIA data, we identify 69 barbs, and select 58 of them, which appeared away from the western solar limb (≤ W60), as our sample. We systematically investigate the evolution of filament barbs. Three different types of apparent formation of barbs are detected, including (1) the convergence of surrounding moving plasma condensations, comprised 55.2% of our sample, (2) the flows of plasma condensations from the filament, composed 37.9%, and (3) the plasma injections from the neighboring brightening regions, comprised 6.9%. We also find three different ways of barb disappearance, involving: (i) the bi-lateral movements (44.8%), and (ii) the outflowing (27.6%), of barb plasma results in the barb disappearance, as well as (iii) the barb disappearance is associated with the neighboring brightening (27.6%). The evolutions of the magnetic fields, e.g. magnetic emergences, and magnetic cancelations and disappearances, may cause the formation and disappearance of the barb magnetic structures. Barbs exchange plasma condensations with the surrounding atmosphere, filament, and nearby brightening regions, leading to the formation and disappearance of barb material. Furthermore, we find that all the barbs underwent oscillations. The average oscillating period, amplitude and velocity are 30 min, 2.4 Mm and 5.7 km s-1, respectively. Besides the oscillations, 21 (36%) barbs manifested sideward motions having an average speed of 0.45 km s-1. Small-scale wave-like propagating disturbances caused by small-scale brightening are detected, and the barb oscillations associated with the disturbances are also found. We propose that the kinematics of barbs may be caused by the evolution of the neighboring photospheric magnetic fields.

Authors: Leping Li and Jun Zhang
Projects: SDO-AIA

Publication Status: Accepted by Sol. Phys., 39 pages, 16 figures
Last Modified: 2012-05-07 13:36
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