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Homologous Flux Ropes Observed by SDO/AIA View all abstracts by submitter

Ting Li   Submitted: 2013-10-30 03:17

We firstly present the emph{Solar Dynamics Observatory} observations of four homologous flux ropes in active region (AR) 11745 on 2013 May 20-22. The four flux ropes are all above the neutral line of the AR, with endpoints anchoring at the same region, and have the generally similar morphology. For the first three flux ropes, they rose up with a velocity of less than 30 km s-1 after their appearances, and subsequently their intensities at 131 {AA} decreased and the flux ropes became obscure. The fourth flux rope erupted ultimately with a speed of about 130 km s-1 and formed a coronal mass ejection. The associated filament showed an obvious anti-clockwise twist motion at the initial stage, and the twist was estimated at 4pi. This indicates that kink instability possibly triggers the early rise of the fourth flux rope. The activated filament material was spatially within the flux rope and they showed consistent evolution in their early stages. Our findings provide new clues for understanding the characteristics of flux ropes. Firstly, there are multiple flux ropes that are successively formed at the same location during an AR evolution process. Secondly, a slow-rise flux rope does not necessarily result in a CME, and a fast-eruption flux rope results in a CME.

Authors: Ting Li & Jun Zhang
Projects: SDO-AIA

Publication Status: Accepted in ApJL
Last Modified: 2013-10-30 16:59
Go to main E-Print page  Formation and Eruption of an Active Region Sigmoid: I. Study by Nonlinear Force-Free Field Modeling  The dynamical behaviour of a jet in an on-disk coronal hole observed with AIA/SDO  Edit Entry  Download Preprint  Delete Entry 

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