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Why is a flare-rich active region CME-poor?
Lijuan Liu 1 #,Yuming Wang 2 *,Jingxiu Wang 3,Chenglong Shen 2,Pinzhong Ye 1,Quanhao Zhang 1,Rui Liu 4,Shui Wang 4
1.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
2.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China;Synergetic Innovation Center of Quantum Information&Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
4.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China;Collaborative Innovation Center of Astronautical Science and Technology, China
*Correspondence author
#Submitted by
Subject:
Funding: MOEC （No.20113402110001）, MOST 973key project （No.2011CB811403）, CAS （No.Key ResearchProgram KZZD-EW-01-4）, NSFC（No.41131065, 41121003, 41274173 and 41222031）
Opened online:23 November 2015
Accepted by: none
Citation: Lijuan Liu,Yuming Wang,Jingxiu Wang.Why is a flare-rich active region CME-poor?[OL]. [23 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4661519
 
 
Solar active regions (ARs) are the major sources of two kinds ofthe most violent solar eruptions, namely flares and coronal massejections (CMEs). The largest AR in the past 24 years, NOAA AR12192, crossed the visible disk from 2014October 17 to 30, unusually produced morethan one hundred flares, including 32 M-class and 6 X-class ones,but only one small CME. Flares and CMEs are believed to be twophenomena in the same eruptive process. Why is such a flare-rich ARso CME-poor? We compared this AR with other four ARs; two were productive in both and two were inert. The investigation of the parameters based on the SDO/HMI vector magnetogram reveals thatthe flare-rich AR 12192, as the other two productive ARs, has larger magnetic flux, current and free magnetic energy thanthe two inert ARs, but contrast to the two productive ARs, it has no strong, concentrated current helicity along both sidesof the flaring neutral line, indicating the absence of a matured magnetic structure consisting of sheared or twisted field lines.Furthermore, the decay index above the AR 12192 is relatively low, showing strong constraint.These results suggest that productive ARs are always large and have enough current and free energy to power flares, but whether or nota flare is accompanied by a CME is seemingly related to (1) if there is matured sheared or twisted core field serving as the seed of theCME, (2) if the constraint of the overlying arcades is weak enough.
Keywords:Space physics, solar physics, active region, flare, coronal mass ejections
 
 
 

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