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Onset of a Large Ejective Solar Eruption from a Typical Coronal-Jet-Base Field Configuration View all abstracts by submitter

Navin Chandra Joshi   Submitted: 2017-07-04 22:04

Utilizing multiwavelength observations and magnetic field data from SDO/AIA, SDO/HMI, GOES and RHESSI, we investigate a large-scale ejective solar eruption of 2014 December 18 from active region NOAA 12241. This event produced a distinctive three-ribbon flare, having two parallel ribbons corresponding to the ribbons of a standard two-ribbon flare, and a larger-scale third quasi-circular ribbon offset from the other two ribbons. There are two components to this eruptive event. First, a flux rope forms above a strong-field polarity-inversion line and erupts and grows as the parallel ribbons turn on, grow, and spread part from that polarity-inversion line; this evolution is consistent with the tether-cutting-reconnection mechanism for eruptions. Second, the eruption of the arcade that has the erupting flux rope in its core under goes magnetic reconnection at the null point of a fan dome that envelops the erupting arcade, resulting in formation of the quasi-circular ribbon; this is consistent with the breakout reconnection mechanism for eruptions. We find that the parallel ribbons begin well before (12 min) circular ribbon onset, indicating that tether-cutting reconnection (or a non-ideal MHD instability) initiated this event, rather than breakout reconnection. The overall setup for this large-scale (circular-ribbon diameter 100000 km) eruption is analogous to that of coronal jets (base size 10000 km), many of which, according to recent findings, result from eruptions of small-scale minifilaments. Thus these findings confirm that eruptions of sheared-core magnetic arcades seated in fan-spine null-point magnetic topology happen on a wide range of size scales on the Sun.

Authors: Navin Chandra Joshi, Alphonse C. Sterling, Ronald L. Moore, Tetsuya Magara, Young-Jae Moon

Publication Status: Accepted for publication in ApJ Journal.
Last Modified: 2017-07-05 12:50
Go to main E-Print page  Quasi-Periodic Radio Bursts Associated with Fast-mode Waves near a Magnetic Null Point  Heating of an erupting prominence associated with a solar coronal mass   ejection on 2012 January 27  Edit Entry  Download Preprint  Delete Entry 

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