Journal of Guangxi Normal University(Natural Science Edition) ›› 2014, Vol. 32 ›› Issue (3): 12-21.

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The Compound “twin-CME” Eruptions Associated with Extreme SEP Event on January 23, 2012

DONG Li-hua1, DING Liu-guan2, CHEN Xiao-lan3, CAO Xin-xin2   

  1. 1. School of Media Technology, Communication University of China in Nanjing, Nanjing Jiangsu 211172, China;
    2. School of Physics and Optoelectronic Engineering,Nanjing University of Information Science and Technology, Nanjing Jiangsu 210044, China;
    3. College of Extended Education, Nanjing University of Information Science and Technology, Nanjing Jiangsu 210044, China
  • Received:2013-07-15 Online:2014-09-25 Published:2018-09-25

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Abstract: The “twin-CME” scenario proposed by Li et al.(2012) which can produce large solar energetic particle (SEP) event more efficiently than the “Single-CME”. Based on “twin-CME” scenario in this paper, spatial characteristics of CME eruptions associated with January 23 2012 extreme SEP event were analyzed, using CME observations detected by coronagraph instruments onboard SOHO/ LASCO and STEREO-A(B)/SECCHI, fitting for CME by GCS model. In this event, the process of CMEs erupting from their source region was checked in low corona, such as the association of type Ⅱ radio bursts detected by Learmonth and BIRS ground stations Wind/WAVES instruments, the associated AIA multi-waveband images on board SDO spacecraft, and HMI magnetogram. The results show that there are two successive CME eruptions associated with this SEP event. These two CMEs have similar propagation direction, and can merge into one large strong CME after certain period of time. The topology of magnetic polarity and eruption process of source region is similar to that of “twin-CME” scenario. The “twin-CME” eruption and the two CMEs mergence may be responsible for generating this extreme large SEP event.

Key words: solar energetic particle, coronal mass ejection, twin-CME, space weather

CLC Number: 

  • P353.7
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